Malicious PDF — malware analysis report

Static analysis result for SHA-256 537f8abe8eedacfe…

MALICIOUS

PDF

84.4 KB Created: 2020-12-17 20:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 98aad3e00ea4204411291f0275649274 SHA-1: dd94fc7191c042e10e4dc1fd09564986b0629ec5 SHA-256: 537f8abe8eedacfe8114b5eeb277f121f70148acb293d5ed403acd837bfdfa8d
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or redirector. It contains numerous embedded links, one of which points to known malicious infrastructure at 'cctraff.ru'. The document body, though heavily obfuscated, contains text related to 'Barbie girl english song' and the wkhtmltopdf application, suggesting a lure to a potentially unrelated malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=barbie+girl+english+song In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fbf14bdce86d.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/3336860.pdfIn PDF document text
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/saxalano_zulukikipo_fizinaguniwusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5fa9a6131dc90.pdfIn PDF document text
    • https://xutifivaluladar.weebly.com/uploads/1/3/4/3/134337767/batefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486981/normal_5fc85ca81f790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5f96848144414.pdfIn PDF document text
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/2664965.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/sinadi/14822617461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce07624-d658-4e5c-93dc-20202a9470e3/sony_str-dh500_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed78af4d-f006-42e5-a08b-0d0c3e6f08c2/49930770773.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/pejanasosexeximulomi.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/siririvikizolufobir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5386f3dfdd95b60f16c7a/t/5fd68843034a586a4f49d2bc/1607895108489/amaravati_anantapur_expressway_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 5136 bytes
SHA-256: 3074c92395447de883e048cbfdfea1d9d05542c2077857e314c4c3248316d30c
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 12352 bytes
SHA-256: cd5969c5227f3ef1e3b8d82622a0979ea13c2b996dfe382c06c738de3158366b

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