Malicious PDF — malware analysis report

Static analysis result for SHA-256 8773efe11a1827cf…

MALICIOUS

PDF

85.2 KB Created: 2021-03-16 13:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1859fd3aac05030d42c8bcaca530866e SHA-1: e432b16bcc7275174d2e11769bb282fb58b33b24 SHA-256: 8773efe11a1827cf1d27f4ef1e6720db0d457385b5c29ec733a2e0bb0bb8da00
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier due to its structure and embedded content. It contains numerous external links, many pointing to disposable domains, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the 'SEO_LINK_FARM' heuristic indicate a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself is exploited.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://lozipotod.ru/award?keyword=seismic+data+processing+pdf PDF link annotation
    • http://zoo-taxi.site/android_16_speech_to_gohand2ifr.pdfIn PDF document text
    • http://bestcreditcheck.info/kokofuwipubomarulimok4m0bh.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/prism_minimal_powerpoint_template_builder_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_600f1e9ed692d.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/67010834164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_600c9c43f3150.pdfIn PDF document text
    • http://boomua.site/lugukugadodazuwulotokaj8fr5x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469116/normal_5fce9c136cfef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370270/normal_5fe0ef85ebbaa.pdfIn PDF document text
    • http://liketsven.xyz/tudukerolagavuzit7kgud.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/gitufegololaweboxixegodit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fee21d2c89fd.pdfIn PDF document text
    • https://zurowesijeja.weebly.com/uploads/1/3/4/6/134630916/390427.pdfIn PDF document text
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/fereforigoxudin.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/8c28dc9d-c1b7-4c5b-a202-b01d8f255cf9/aristotle_nicomachean_ethics_book_3_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09440042-531c-41f2-b322-4421805692e4/bagudovoruselisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b545ed-e550-4e0d-93e1-a7fa4e4ad62d/how_to_do_grounded_theory_coding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c6fd83-cc36-4039-b5fb-e19d1612e64d/labudad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e048a2-655d-434b-924f-6bc7773e573c/xodegesabelukari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61e9181-a11c-4f41-a844-92d0149ab94b/the_woodcock-johnson_iv_test_batteries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522d7fac-db3b-4271-ae2d-b4b3ada79c80/66602177205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55cb60b-e798-435d-afc5-b94eafcd23e7/what_to_say_instead_of_itll_be_okay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7d9795-d918-4a25-999b-70f296097f30/how_much_horsepower_does_a_jeep_grand_cherokee_srt8_have.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_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 5332 bytes
SHA-256: c9f3f66b214c4b559249808ca71304da96e11f6f96271929caa72659986276ac
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 11344 bytes
SHA-256: ccf5b7be91b5083d97f7c204aec1e9895bb53442b0e972dd7a5c184f2b801ce6
font_02_sfnt_off0001390b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176