Malicious PDF — malware analysis report

Static analysis result for SHA-256 a158d01f6f730200…

MALICIOUS

PDF

87.2 KB Created: 2021-01-04 18:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 654d36065a3025cba955ca47ff6b460a SHA-1: 5a51f6ccf3ab937c2dd33ade1d38677c2695e306 SHA-256: a158d01f6f730200576a825c8452ccd333714f5d5e652172a879a0a65ed9e77b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary URLs, https://traffnew.ru/aws?utm_term=flvs+answers+english+1, is suspicious and likely part of a scheme to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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
  • 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.
  • 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://traffnew.ru/aws?utm_term=flvs+answers+english+1 PDF link annotation
    • https://cdn.sqhk.co/favejofu/fhh7yia/sivofizifiritunoguvarafu.pdfIn PDF document text
    • https://jakoxizejibak.weebly.com/uploads/1/3/4/3/134348863/xetofesa-fobemed-gogaxi.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/duxibalezegotavotemo.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/cjjgdhr/kiguwavusojusogo.pdfIn PDF document text
    • https://foniliwis.weebly.com/uploads/1/3/2/6/132695455/loxukuge.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/d6596baf-67e9-4771-9925-45d7d970207e/st_marys_catholic_church_spring_lake_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fileact_implementation_guide_for_score.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/88427055945.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/50716615626.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/51036037413.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/subigisujikelo.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/vofanenafaravexik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c55453e-650a-48ec-bc62-e52d54e0f306/53028049212.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_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 3072 bytes
SHA-256: 497941c3c08ecc0b262f87bd89b558ed6946d05838e2cc8674ba686b3c90a602
font_01_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 5104 bytes
SHA-256: 1d2c0af7516f4deb4e26e6965ddd6f121f3f297fde6f5acae8a0df308dd60d21
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 12120 bytes
SHA-256: 7b2e7fa6a077e40501e712609eb450491d92e9bc880adc1d573918d72e5828eb

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