Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4d60498e9e58b2…

MALICIOUS

PDF

88.7 KB Created: 2021-06-08 10:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e2ca96293f23b91ed8026b4fa97214a0 SHA-1: 54c5128967a1d00cf5c3c2669fcb1dc701bc44cb SHA-256: 6a4d60498e9e58b236bc1d5a9730564c97e27b3a033291fe72ad0e38e7684eff
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://chcial.ru/pbw?utm_term=symbolism+quotes+in+the+house+on+mango+street PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380078/normal_602ebc26bb738.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/7f70a.pdfIn PDF document text
    • https://kotageluvo.weebly.com/uploads/1/3/4/6/134652464/titiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_602fbf81c4306.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/ripepep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5feb9f6835ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_604f0e9549ece.pdfIn PDF document text
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/62a0ba.pdfIn PDF document text
    • https://kexeretuzigu.weebly.com/uploads/1/3/1/6/131637303/gotuzugofo-fazetobo-baxox.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421210/normal_60b05f53ca562.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/1c1e6b28-9694-45fd-b273-1b7d922bd301/greek_gods_and_goddesses_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef679e75-6c15-42a2-b14d-78f81a745706/54873490808.pdfIn PDF document text
    • http://bolejagum.pbworks.com/w/file/fetch/144812907/fraction_coloring_worksheets_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05dfbe4-7131-434b-a983-c1eb16c8763d/44326521060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9b65d0-063e-4c2b-a76b-25eceb7f6477/jezifokix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05b3251-727b-4e4b-975f-06f408ef9cc3/how_much_does_it_cost_to_fix_smart_tv_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701b41e6-60a5-4557-817e-c95288ff9d02/38491987629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c69a12-10bb-418b-b66b-5273acfa45dd/favorakoxiveletininamura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2472e787-5726-469d-a314-6e979d6f40cf/getokexog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386514ab-2b3d-410d-9db1-ccbe37d95e87/31431844149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67a64cd-6945-4429-ad0b-8219337bdb41/fullmetal_alchemist_brotherhood_again_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13b0296-6077-4662-b37d-280305b40be7/presonus_central_station_used.pdfIn PDF document text
    • http://gibabug.pbworks.com/f/are_isabella_tiger_moth_caterpillars_poisonous.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_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 5572 bytes
SHA-256: fb75d729ebd237678b405a0d1f40b8e550b8eec60c2c1b4f1b3f45a8af013713
font_01_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 10804 bytes
SHA-256: e72b928e02223fa7ab6c59297466c84e54a85a602e321f07fa8a4ac59e31f0eb