Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b48f137060533a…

MALICIOUS

PDF

81.0 KB Created: 2021-06-09 01:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bd623a1909502f087b8e1b1fd4608335 SHA-1: 3dc4b5056f07ce6178a37a14945399fd0c1b9977 SHA-256: d3b48f137060533a4a239f178821d86f837b64d8efe2c84151d5543cb30861ce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://golowaki.ru/123?utm_term=tangled+movie+free++300mb', suggests a lure related to free movie downloads. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this is not a legitimate document but rather a mechanism to redirect users to potentially malicious or SEO-abused sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=tangled+movie+free++300mb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417526/normal_6047baa58dbbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67ee95355a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375206/normal_5fe2f60d32ddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_604904fb0c27a.pdfIn PDF document text
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/2873337.pdfIn PDF document text
    • https://siluxukazikuwo.weebly.com/uploads/1/3/5/3/135326211/gawuvugo-doxumam-sekonoxifewi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_5ff9c0808b109.pdfIn PDF document text
    • https://fetarulezi.weebly.com/uploads/1/3/4/4/134487317/wajeg_doturawejijojav_xigebo_xaxunuweleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_604ce8b01578b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4380380/normal_60b212f823729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5fe1cc199077d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_605c693204da0.pdfIn PDF document text
    • https://vavurozuzen.weebly.com/uploads/1/3/1/0/131070500/5266514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_606cca8a4ba55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8d3b50a2-4cf4-4423-a94c-4cd4ea3eb5fb/guitar_chord_sheet_music_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1b2f23-fb4b-47e1-80f9-c39792ad55b4/40367514329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f407461f-f1a0-4e0e-8ee1-5328aeb7c737/1969244478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52e7979-1a98-460f-bbe8-cc0bd494143b/michigan_medicaid_provider_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d82c3ad-0783-4ccd-a78f-074997f63fdd/hyundai_certified_collision_repair_center_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8ff35e-0adb-4465-ab9c-86694d52e064/limites_de_funciones_ejercicios_resueltos_1_bachillerato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12b9fa4-08c2-4e0b-838a-b4f29a19b37c/tovusiwigewigumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36f7901-854d-47ea-9f2b-286d462e3b66/pepogu.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_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 5212 bytes
SHA-256: 2761bb5db081f42ad9796ee8fb9fa32ee9146bf3c7ed69f759e5d1456e7384cc
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10772 bytes
SHA-256: d1b8dba53b95fd6691e9a1f16c4ee4b39408122c995378d43d31e29c2572e9f9
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c