Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a38eb4130ae1899…

MALICIOUS

PDF

63.1 KB Created: 2021-01-25 20:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: de5f55041dc2e8d78765f20332866de6 SHA-1: 3089d681a8fc8a4acd1b875d7e20ef0d50a51b07 SHA-256: 1a38eb4130ae18996beb71669ae575a08383d989277ef048e81595d5733ddd12
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains multiple embedded URLs, with one specifically linked to a 'tasfa application' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=tasfa+application+2016-2021 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453528/normal_5fec241345e4f.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/7ijgfiU/golden_lotus_slots.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_600be1871b3f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ffb50587d91f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5fde1f9076f2d.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/AOvjfhd/brain_stress_balls.pdfIn PDF document text
    • http://xeresorejal.iblogger.org/fijisiwepetiniw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvowafavij.epizy.com/naruto_obito_wallpaper.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/alarm_clock_sounds_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/tunuritagidale.pdfIn PDF document text
    • http://bejitepirisobi.epizy.com/86000264893.pdfIn PDF document text
    • http://wumuduwowuwi.rf.gd/abnormal_pap_guidelines_ontario.pdfIn PDF document text
    • http://nimobavaze.epizy.com/kafuzagivogupixevupovag.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_off0000ba9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 5372 bytes
SHA-256: 868765d596117bb561c25d9f00a17052851499ec018038cf9d04d6c41b38bf6d
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 10128 bytes
SHA-256: e5d48854a48e798a3366dbbe3cfd91a59fe36df03799d56d1ed4122998f60a76

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