Malicious PDF — malware analysis report

Static analysis result for SHA-256 50de4317d0d6b419…

MALICIOUS

PDF

72.6 KB Created: 2021-03-28 20:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c977acd327f3585e5913a1f53fe2c68b SHA-1: ddfb5a265a6140db3c788c1422c65a6b81fb9685 SHA-256: 50de4317d0d6b4194a8eb2ee9c08826a779a6b1abab33e88d3a154abaf911555
194 Risk Score

Malware Insights

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

The PDF contains a high number of external links to disposable domains, indicative of a link farm designed to host or redirect to malicious content. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=speak+your+mind+2+pdf+download PDF link annotation
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/bigovap.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/golakumejumetusoda.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/63867062128.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/479e660bace0.pdfIn PDF document text
    • http://jakor.pro/27815246919kg8ro.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/cessna_152_instrument_panel.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/dezik_tekolowu.pdfIn PDF document text
    • https://mimedotaxejibi.weebly.com/uploads/1/3/0/8/130873786/6791272.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/39179468005.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/5308674.pdfIn PDF document text
    • http://cethq.xyz/99801276836q71h8.pdfIn PDF document text
    • http://gatorama.site/kowivilomizm1g.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/5aab31a1-7037-49bd-9d5e-ded59b0b07f0/list_of_calories_in_food_nz.pdfIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_c3952c21805f4b5eb0b4d6b6866c0baa.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_36323f7a05a64549bb19b94e83badb52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bf2418-f10b-4af1-82a8-fa9de931b7e0/48098157860.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_302a73e157e54fd09d789010e5307dcd.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_b1effc72ad2c46a2b91b773cf6f079ec.pdf?index=trueIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_a764fe60c7c346a0b96353c36e51a66d.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_422b6eb932b840ef958f2f1593ccaacb.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_99bda4eed69e4d17a3da11a4dc45c5e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb61e4a0-3856-471f-a6d8-cdc96a1d91fd/shadowrun_returns_best_weapon_for_mage.pdfIn PDF document text
    • http://jutagejefutix.atwebpages.com/nabubima.pdfIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_0302baf3bea9459bbc001b68f965b0bd.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_172e7f35ce9e4c48909c483983c1674e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2751ed25-8bef-427f-94eb-8f199b7a4ebe/toserujitapedodokudunol.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_5f63fb98f4c9476898c13d6514316040.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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 5500 bytes
SHA-256: 96de0955d3c14a377bb6554a794069e1e11571728612f5d32256caeb59d17bbb
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 10832 bytes
SHA-256: 81c337fbf7c81a1d7b16566ee17d534c824188c94a92d2d19a2d99611cf6d331