Malicious PDF — malware analysis report

Static analysis result for SHA-256 275999bad377a2ac…

MALICIOUS

PDF

111.4 KB Created: 2021-06-06 13:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 652192bca95bcefd0138eb5a77641384 SHA-1: c88cb633c7b383507c1cb69555fe845b9f1f63fe SHA-256: 275999bad377a2ac2b8ee1cb948342fbd7680f7930c6c0506e2629d8ed5ce9b6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/pbw?utm_term=unblocked+games+76+weebly+rooftop+snipers PDF link annotation
    • https://kumazazunanij.weebly.com/uploads/1/3/4/6/134622964/ad67f34fa1.pdfIn PDF document text
    • https://pozetegafikule.weebly.com/uploads/1/3/4/8/134857311/8054171.pdfIn PDF document text
    • https://duzunadi.weebly.com/uploads/1/3/0/9/130969775/doxugoremugewis-vekegum-kuripabed-lajakux.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/tedadupajitu.pdfIn PDF document text
    • https://wixalotoduf.weebly.com/uploads/1/3/5/3/135305273/xugan-todemiwewek-jawuzigafofuw.pdfIn PDF document text
    • https://jeziwirumefije.weebly.com/uploads/1/3/4/6/134670599/ritobifolam.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/1973863.pdfIn PDF document text
    • https://padokerasuwo.weebly.com/uploads/1/3/5/3/135319223/dumujalu-magepudufomum-labubifebofufa-bebuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1403d913-18a9-4612-a9cf-f44fafe2ae17/how_to_gain_weight_in_vegetarian_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f9a8e5-5ac5-4515-81b9-caf32f74d5f3/simudis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0367a46-e768-460a-afed-ff9165d8993d/what_oil_to_use_in_honda_1000_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4770ad7-219e-436b-9557-f6d8c967d267/tuvigodafixode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fb2461-ea51-4194-82bb-41d78e92eb75/disazenanudozodaxawe.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144616851/how_to_use_cuisinart_smart_stick_variable_speed_hand_blender.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/34306539179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a134167-0884-41dd-8115-e7a5d5db0a32/saaho_movie_download_mp4_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4e5624-95a3-4a8a-89c6-99d2fc4edff8/are_soda_king_and_sodastream_bottles_interchangeable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7653c640-1495-4082-9c8d-819e5cb04627/mugolanokovezalujoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef681d4e-6efd-4574-b640-c8e6ccb1062d/gedojasoved.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14925 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00015a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0A 6100 bytes
SHA-256: 0bb25109bf7cef44dc2ef47bcfa5d8b8720e69f886f01ee5d4fca4d4060a3d1e
font_02_sfnt_off00016ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED3 13620 bytes
SHA-256: 8a7121a943cd2c6ae2b2ffc99ddf4d1d2da3961e1c4cdd3172bede36612c77b0
font_03_sfnt_off00019a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A85 16132 bytes
SHA-256: 60f53b17f7925ac1818ac9336ea58fd206fea48872b5377b70e6fb8114080afd

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