Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa4efdbb18ff469…

MALICIOUS

PDF

86.3 KB Created: 2021-04-18 10:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3fa291ec0b771a043be0b1d72a5f9e59 SHA-1: 7fca829e0c53c0effed712f30f1e4a8f18787942 SHA-256: 1aa4efdbb18ff469460fdc4dbc97538f9a2d26f86a73d924f95d62f202f8704f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=principles+of+biochemistry+5th+edition+pearson+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456116/normal_604e9f1d4ea73.pdfIn PDF document text
    • http://faketikus.22web.org/accommodation_request_form_ielts_listening_answer.pdfIn PDF document text
    • http://ouily.xyz/saxofay0s4j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_5fef42ede5bc6.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/32275289604zry9w.pdfIn PDF document text
    • http://gumoximowukowot.iblogger.org/understanding_and_using_english_grammar_vk.pdfIn PDF document text
    • http://servempieza.site/sparknotes_macbeth_act_4_scene_1_translationf726j.pdfIn PDF document text
    • http://monoga.space/pill_reminder_app_android_source_codemwrh6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_65adafd08d8349d4a59b534f73c9ad26.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_fbf79b3ae0b245d6852ff3059b6fd53d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c86f292-d211-4217-8246-72e5db43c418/casio_calculator_fx-9750gii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd0276c-f394-4daa-9eaa-37556fe4e42f/bon_iver_i_cant_make_you_love_me_nick_of_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1697d119-e10b-4b31-bcc5-0d5f8ebf92bf/wepowalopuvunixuf.pdfIn PDF document text
    • http://majilutiwuxas.rf.gd/kenmore_70_series_washer_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ba476f-dd22-4bad-940f-22b4099e1042/66749633746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935c3674-aadd-4eaa-b11a-a45638e2c197/busozadime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4bacd5-f187-40c8-88cb-abf7fb6f8f2a/tobopafawobuna.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_87c58fd3cfb948168d606c2fba921537.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 5760 bytes
SHA-256: 32cfbac6d5ea3cbbd61009e64eaa70b8a476d27e47d2356025e4c79fe5de9e87
font_01_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 10888 bytes
SHA-256: 92af9930891a126318f8c09440e2d00d3c4a14ba0c7cf58120d752f420b06120
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 16076 bytes
SHA-256: 1621a87b6bc266bc0e3d5871723ec36fa76dd6d2c9fb76f212020cc469043148