Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96cb7cb0ea3a260…

MALICIOUS

PDF

94.0 KB Created: 2021-03-24 05:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: da6529e02b0ee82bebf0a48eb0d90775 SHA-1: 76399ed6a743cfcde29d14ef243ae9ce3249d775 SHA-256: d96cb7cb0ea3a260f231bb1a7151d0af70bb6282de7092f7634945a3b32d0b3b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/award?keyword=alistair+maclean+pdf PDF link annotation
    • https://nazigexasuv.weebly.com/uploads/1/3/6/0/136081917/9515668.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/8547464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fe8deca7ba17.pdfIn PDF document text
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/004cb8.pdfIn PDF document text
    • http://mitsumoro.ru/towuwibozirufaxa7t3up.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/HIQieDd/53212202163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fffa42b9c2b8.pdfIn PDF document text
    • http://artyom.guru/how_do_you_bypass_a_motion_sensor_light_switch5j9uo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6020c963e9b2e.pdfIn PDF document text
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/08be7d66b80eb.pdfIn PDF document text
    • https://gerezedudamun.weebly.com/uploads/1/3/4/5/134507019/sukofak.pdfIn PDF document text
    • https://popovomogomube.weebly.com/uploads/1/3/0/7/130738885/linel-nagomezavum.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/02qBUSX/ice_cream_recipes_without_eggs.pdfIn PDF document text
    • https://puxinatax.weebly.com/uploads/1/3/5/2/135295704/9573839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_602e9d5449fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_5fe8a995e5212.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/c5f6a0d6-af47-4487-a780-6cb911a8205f/danoxixilubaxezofev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5651d0-c04a-4532-83b5-37d37a8aa6e4/construct_2_full_free_download.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_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 5288 bytes
SHA-256: 27ae17bb1ffa1375c2a07a0114c721f5053903ea98fa149a368ab8c91581a07f
font_01_sfnt_off00014118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14118 12788 bytes
SHA-256: 32509574ca34fa3b1a414d5bc40fe22ccb3c26756d14cc2bc332cfbd4f7ca30a

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