Malicious PDF — malware analysis report

Static analysis result for SHA-256 de094296f1f404c6…

MALICIOUS

PDF

77.0 KB Created: 2021-05-27 03:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a768cc703ad7f818eb396dc2072c70cb SHA-1: 2100ace0537192bd98f4ac005a5193ecaf3f0530 SHA-256: de094296f1f404c6adc7fe31e98f9ec05dde5b9739f9910d4249c3706a0d1b1c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains, including disposable ones. The primary purpose appears to be SEO manipulation or distributing further malicious content through these linked PDFs.

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://bologen.ru/strik?utm_term=ejemplo+metodo+logico+deductivo PDF link annotation
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/kerosimomujanaze.pdfIn PDF document text
    • https://dowoxadi.weebly.com/uploads/1/3/1/3/131380004/pituvejaruj.pdfIn PDF document text
    • https://sosabugipos.weebly.com/uploads/1/3/4/6/134657522/sogowug.pdfIn PDF document text
    • https://dalemugoxopil.weebly.com/uploads/1/3/4/5/134587536/0630c7430.pdfIn PDF document text
    • https://bexubumid.weebly.com/uploads/1/3/4/0/134040754/tetolitafak.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/2aad8f.pdfIn PDF document text
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/fapakafi_lexuk_kigevusajoso_mukilobar.pdfIn PDF document text
    • https://sixamipad.weebly.com/uploads/1/3/4/7/134726782/a1867777.pdfIn PDF document text
    • https://xalebune.weebly.com/uploads/1/3/4/8/134889571/1606066.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/93eca446ce358e.pdfIn PDF document text
    • https://tiseparalav.weebly.com/uploads/1/3/4/7/134735838/pobudibamegofev_jemanib.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/654804.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/vufuritekexi.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/06e97c2e-033f-4040-b14b-d735a7189cb3/tavudukugagufip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a06723-cc67-46d5-a304-aa50c00b11cf/wunufinofutufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc85b1b9-7852-45cc-99ca-314b1300ff0a/the_seventh_man_haruki_murakami_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6565f869-0592-4d54-9c42-727ff09117e8/formato_de_una_minuta_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972f029b-ce8e-4af0-8fad-bce77ea514e1/zitufiluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9674183a-8127-4d08-8b2f-6cb0a29be8cf/is_testbook_good_for_current_affairs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9be3ed7-5fc1-4cd5-a242-86b191e3609a/43970075873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ff24e8-b446-4f0f-ba9f-cd7a8fb7e7ea/48350621497.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_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 5004 bytes
SHA-256: 474b1820319eea68790969609478d768b906a824e986cb33941033069210aed5
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 12276 bytes
SHA-256: 6c7d48a7dac5a0306a4c7c9dce7eaa2a7648436ae491e37238e78793c6407df6