Malicious PDF — malware analysis report

Static analysis result for SHA-256 3307e7753aff1c2f…

MALICIOUS

PDF

73.9 KB Created: 2021-01-06 09:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9500539e69e963890549f146dff4e9fa SHA-1: 9aa792d8ff98adc67e2f8f0954edbb722dc90061 SHA-256: 3307e7753aff1c2f7912cce3cebaa05ae5a1e54fed5b352f397d4588e8dad332
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting services and are associated with redirector infrastructure. Heuristics indicate this is a link farm, likely intended to manipulate search engine results or lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, possibly related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=diarrhea+guidelines+who In PDF document text
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/5802422.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/Yjc5Dgi/super_jabber_jump_5_level_15.pdfIn PDF document text
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/fasetineg.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/4ozN1gi/62025206624.pdfIn PDF document text
    • https://segawerod.weebly.com/uploads/1/3/4/3/134313685/6861200.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/hbApKVE/xetakesejowumulen.pdfIn PDF document text
    • https://xitesinunupur.weebly.com/uploads/1/3/4/3/134318791/nadofojizofo-baxeto-fitezuzijemigor-kezozigoxapa.pdfIn PDF document text
    • https://gorixekaliwe.weebly.com/uploads/1/3/4/4/134439057/degen_gosubuxelamif_jorodokab.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/c103c10d-0a25-436a-9525-b17c96459a5c/time_travel_d_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b577eece-4f27-4143-bc8f-f8e2c2d63caa/66416694296.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/hack_whatsapp_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a3af16-8a98-41aa-af30-8af861cf1bbe/rowipibezoguxudolisov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276881af-fb94-4479-abff-7ba30b57943b/vebusovo.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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 4980 bytes
SHA-256: 6557fe7620c9344c1fc83f384fe6c9a50b11db5dd0657ad1da7395ffd3a3a3ce
font_01_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 10076 bytes
SHA-256: 99ae9d2ff6c88c4ebcb1a7b74c3f2e02bc9a4f4a0c4ba5d86dd6961a27f6f295
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.