Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba13bf0c492817e…

MALICIOUS

PDF

89.2 KB Created: 2021-04-10 04:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 06a196af1725bf5cc4f82cb0389e1220 SHA-1: 55c33a3106cd7f8001771d522eb3eff3972d586f SHA-256: 0ba13bf0c492817ea3e73546413a9bce1d61e44cb9cea524a49e47189650881c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a novel summary, likely intended to drive traffic to malicious or SEO-manipulated sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=prince+caspian+novel+summary PDF link annotation
    • https://cdn.sqhk.co/roretuduva/QhiiGge/diy_shattered_glass_ceiling_necklace.pdfIn PDF document text
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/efa7a5d52627e.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/djcjgED/33507995252.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/design_and_analysis_of_algorithms_gate_questions_and_answers.pdfIn PDF document text
    • https://pojaxereb.weebly.com/uploads/1/3/1/4/131482957/1658142.pdfIn PDF document text
    • https://xezafeliwi.weebly.com/uploads/1/3/1/3/131381443/a42870a9ac4745.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/f59e16a.pdfIn PDF document text
    • https://gudetopop.weebly.com/uploads/1/3/0/9/130969639/tujejejobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/arman_alif_songs_mp4.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/womens_long_to_short_haircut_stories.pdfIn PDF document text
    • http://kubuleg.rf.gd/gidulowu.pdfIn PDF document text
    • http://kuwemujureza.epizy.com/causes_of_inflation_in_kenya.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_0d5ac70306054abfa1f634f7a8975e69.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_ddb5458509a443dd87303928cb8abac5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/tl-wpa4220_v4_firmware_download.pdfIn PDF document text
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_d87c6d87113d48dfb4c116642507cdc9.pdf?index=trueIn 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_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 5240 bytes
SHA-256: d7ec5e3789c1b3cbcfd4e7e401e046534a0565e4512057206a80cd3bd6358a7c
font_01_sfnt_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 10668 bytes
SHA-256: 6b3f6b291d95e55e2d08eea019e1867265285610eb49a1382c1561b8c6536514

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