Malicious PDF — malware analysis report

Static analysis result for SHA-256 2708c444325ef794…

MALICIOUS

PDF

84.5 KB Created: 2021-03-27 18:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfc26d94a1a9e36bbf3c32509a26ca6d SHA-1: 4ea96392c32748653515ba00db510f312c0b3148 SHA-256: 2708c444325ef794249a4c871d9f9c1865300a6bd5cbb12c42a39fd7f0fb80c6
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, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=arthur+rimbaud+le+bateau+ivre+pdf PDF link annotation
    • https://tovexalo.weebly.com/uploads/1/3/5/3/135348509/101ac7bf2.pdfIn PDF document text
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/9593100.pdfIn PDF document text
    • https://duzezefoge.weebly.com/uploads/1/3/1/4/131437668/7646957.pdfIn PDF document text
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/totegagapokopuzanot.pdfIn PDF document text
    • https://madonosole.weebly.com/uploads/1/3/4/5/134582414/bajuda.pdfIn PDF document text
    • https://sivobevabe.weebly.com/uploads/1/3/4/6/134665070/xegidupokifaku_gemobimutol_tuvofot_zedebarit.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/948fbaa6-420e-4077-933b-3e1d95fc9772/pufexobakuferop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f152d4-3701-4803-8532-3d8ee6b429c8/weather_and_seasons_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/33869798213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12612462-5de3-4ea7-9357-e82f45a46172/tuvazosakuwidigixo.pdfIn PDF document text
    • http://zojimako.rf.gd/gebunegifebaxilaxa.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_6a6225ab99ef4a54833d186d76d9e9d9.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_e7b7831e7e82472c9d2af96b5ccba61b.pdf?index=trueIn PDF document text
    • http://mizozibobekujul.rf.gd/are_unmarked_police_cars_legal_in_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/47568970069.pdfIn PDF document text
    • http://ninovaxabax.epizy.com/why_does_my_refrigerator_light_not_work.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/19935126808.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_e960a1cce31c41bcba71d9eb7c2ba2ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/vezafixakon.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/child_rights.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_71c13d311bb849b5833eb0a2d188cf4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7b05d5-5c6a-49f6-8b42-3014bffd1002/clicker_remote_garage_door_opener_keypad_instructions.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_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 5292 bytes
SHA-256: 37486441621dcdc9cdd65e8dd064f5975d6b52c359dfed7da6bf62665e56f458
font_01_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 12672 bytes
SHA-256: ab4116a43310dc83666300942b96f73dfc8c2e87a0765fed6d12859f37377b5a