Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3db44308fdd68e…

MALICIOUS

PDF

81.4 KB Created: 2021-03-19 16:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e75932c0c619e39a7768841991cbcc01 SHA-1: d6b7c7c6deae29338b6268742baba511683672a9 SHA-256: df3db44308fdd68eaba5f2083464aa4bf4a950fec7336d656ac8586578471dbc
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm, and one URL is directly related to forwarding phone calls, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/aws?utm_term=how+to+forward+phone+calls+on+verizon
    • http://goldstein.capital/ticketmaster_tickets_e_tickets6tk5o.pdf
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/a009110180b.pdf
    • http://kadaxejob.mypressonline.com/pigerizenasu.pdf
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/2f52453.pdf
    • https://robigatif.weebly.com/uploads/1/3/0/8/130873787/7771836.pdf
    • http://braco.ru/xefatisetigesod0ectb.pdf
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fff03fbea682.pdf
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/godipixixugapofa.pdf
    • http://bopugafuwu.scienceontheweb.net/segmentation_definition.pdf
    • http://lunesygets.xyz/breastfeeding_guidenzvrb.pdf
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/keseda-doxaneti-kosenivinituwaz.pdf
    • https://kexefofivib.weebly.com/uploads/1/3/5/3/135305266/zowiponojijitofenite.pdf
    • http://dommasters.site/5824920599ya5x.pdf
    • https://zisibunekotif.weebly.com/uploads/1/3/4/9/134902626/232266.pdf
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/7e45d4c97db093.pdf
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5ff21a554c90d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/078de949-210d-4f15-8602-e6ecb4938006/vugipadovoxojezuxiva.pdf
    • https://uploads.strikinglycdn.com/files/7113812b-e336-4e21-9fe8-957349cfe142/93227071514.pdf
    • http://ligiwekuxote.myartsonline.com/assimilation_in_english.pdf
    • https://uploads.strikinglycdn.com/files/9c01d95a-d432-476e-8d23-94c3896a172e/36503625090.pdf
    • https://uploads.strikinglycdn.com/files/94456f47-3b17-4aac-949e-641a707184ff/nulifoxobuxak.pdf
    • https://uploads.strikinglycdn.com/files/db98442e-9ac8-4763-9102-c3e40ea2462d/tasam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb52.bin
e1be2bb466f4493496706eb625c6e6ecc1aa6ae1e928b28680fa0efd60017530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 5408 bytes
font_01_sfnt_off00010dd4.bin
d987883302ed0a126df6b5933cb2400372cc9d6a9ed39aee471e498364e47298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 13052 bytes

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