Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1f73829693e911…

MALICIOUS

PDF

81.6 KB Created: 2021-06-13 11:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c8424f5bb768dbd93fccf1017ec094e1 SHA-1: 6c110ac46309bdb29af5e7e1e76920287685830b SHA-256: 5a1f73829693e911c2b2145bc5bfeaad276d1de7cf0b7ea3c1c6f5f549638b55
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 hosting, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

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://pixomot.ru/pbw?utm_term=the+encyclopedia+of+modern+bodybuilding+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500889/normal_604ec7417f2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_60241a5458adb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_60582dca50b94.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/xiwozafotab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_602c0d5a69b4e.pdfIn PDF document text
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/6bdd96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fd1440e265a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5febb0876f177.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/e60be34b-4585-4046-842a-4ab285db3336/48155226462.pdfIn PDF document text
    • http://pakaguwazu.pbworks.com/f/t_shirt_mockup_after_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d47275-211f-439d-9158-55ae4ce92339/wd_my_cloud_mirror_manuale_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1257750a-761f-4cad-975c-cdbb49865cfd/wujofedapatexifole.pdfIn PDF document text
    • http://ketejar.pbworks.com/w/file/fetch/144840285/chinese_buffet_restaurants_in_nashua_nh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9565075a-2b08-4f2a-a020-fdf50f313901/how_do_i_fix_msvcp140_dll_download.pdfIn PDF document text
    • http://ridezerarumu.pbworks.com/f/96148918463.pdfIn PDF document text
    • http://zikulade.pbworks.com/w/file/fetch/144851997/13359598793.pdfIn PDF document text
    • http://litopure.pbworks.com/w/file/fetch/144973596/pokemon_go_spoofer_for_android_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0668886-dcc4-43c5-aaba-00ba92599d62/bosch_vision_300_500_dlx_clothes_washer_error_codes.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/walking_in_a_winter_wonderland_piano_sheet_music.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_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 5672 bytes
SHA-256: 71c91b1abf5e4c1b69aecda108bfacde7e445bcfd19ce70df579e11af7389449
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 11932 bytes
SHA-256: c6007254f442ee72770b561b4545970cc2c3a139b3fa0412448c5e998ad1cefc

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