Malicious PDF — malware analysis report

Static analysis result for SHA-256 9711f5f7e5ed25af…

MALICIOUS

PDF

76.7 KB Created: 2021-03-19 21:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 27466da07eeafed3bf3f299e7acc1a6a SHA-1: 6ec6d40b74b36ed5b7beb84e2250f14e7402f512 SHA-256: 9711f5f7e5ed25af54f507e2fb1e570d2384ea9ef913ca0849048cacae2d633a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain. Heuristics indicate a link farm hosted on disposable infrastructure, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged the PDF as malicious. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/123?utm_term=guess+who+sheet+template PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_daaef55f5375443bb7ecf22c95020301.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b543c6e-8ea2-4e84-ab73-a7760dbfacf0/five_fold_ministry_gifts_evangelist.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/38867422283.pdfIn PDF document text
    • https://fca510ab-500b-47d8-b5d6-cd0a4c718770.filesusr.com/ugd/c4f63d_69e3042cbce04115b6b1ccad94380dbd.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_ffb5d8af521b4e30910e6f74bf87e2a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/kajiluvijusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030f4f86-d2b3-400e-9a42-9258b628e13d/hisense_300-sq_ft_115-volt_portable_air_conditioner_with_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4b5db5-b9a1-4ad8-ba5a-da460f0c96a2/wefexudosekexodo.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_f4ddbb5543784ea6a9fc57cd94075d3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobobowu/anubhav_mohanty_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09aad7d-1305-43e6-b687-248080f2a736/zopivuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63ae65b-8a89-4650-a921-c1704adcb618/matoral.pdfIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_b05f9ae2faaa44a79631cdf3352150e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3bd5f4-7646-4f32-9831-04f168f0c780/qcy_t7_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/happy_birthday_sheet_music_for_flute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100a29f0-05b5-4429-98a0-afdaa6ee069f/41730437855.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/flight_pilot_simulator_apk_android_oyun_club.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5264fc3e-dd61-49ba-9899-181e0775bf24/les_95_theses_de_luther.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/gukumideraxerijuza.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/tizumida.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/69144315467.pdfIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_fe35f7024a5e41b4a6bce56f700d0fc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf77c314-3feb-413f-8116-a2103cb70e23/43440172918.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 5084 bytes
SHA-256: 8c0bed8f346fee26d6ee62010445d032f62a9c4e59bf27f205907f41a7bd1817
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10940 bytes
SHA-256: bbf9caed6750213ce134b309d48569e7620ba4802dad9f635575c99825a00683

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