Malicious PDF — malware analysis report

Static analysis result for SHA-256 87da52c5bd7a01e6…

MALICIOUS

PDF

86.6 KB Created: 2021-02-25 10:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c44ec6eb4b0d974d42bf1ee0898bf57c SHA-1: d6d954813fc4df25a132c08ada3da92992bcacdb SHA-256: 87da52c5bd7a01e636ea88c66cf81cc70773ba773f0ab30616b0747a3e4650c8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=best+mechanical+engineering+universities+in+pakistan PDF link annotation
    • https://cdn.sqhk.co/mipemoku/hpjhbhc/47748902931.pdfIn PDF document text
    • http://gachihyper.xyz/reked8yoqb.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/3jl9gh4/ritowiwuxibisaxawa.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/gihiGPD/xotodoniwutorebovevirij.pdfIn PDF document text
    • http://lojasamericanasbr.com/kinilupahsbov.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/gjgUQtv/knock_down_frame_vs_welded_frame.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/n96FgdZ/d_day_1944_movie.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
    • http://mavixufomulene.rf.gd/sex_coloring_book_printable_free.pdfIn PDF document text
    • http://kalilom.epizy.com/51013771351.pdfIn PDF document text
    • http://ditajizuru.rf.gd/quantum_numbers_questions_and_answers.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/72143842361.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/naromadumoxumetuxego.pdfIn PDF document text
    • http://fulatunufesaze.epizy.com/mugusesuzuxutufuxuvexeved.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5292 bytes
SHA-256: 6844f2e6bf8d0512046e9271ff336b327565d922e5e7645d6ae10127edf3f39d
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10620 bytes
SHA-256: 1244ad336819b0fb0309ecdf56749ed0ba5ef744c18e8618395e885ea1e8e9b4
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 16068 bytes
SHA-256: b09879be15c6eb2246ae7b48c1c275502bdacda3194b2e7a150da035b49823e9
font_03_sfnt_off00013e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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