Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d2da333f1bb991…

MALICIOUS

PDF

82.1 KB Created: 2021-03-05 14:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 74996bc34bfb1026b521d6ace459a3c3 SHA-1: 219e3db1f87ce4a2817644f7354834824328dd1c SHA-256: d5d2da333f1bb9916c0916eb97c948e5d68de5dfe1c98f867e6c5cf87e51eb93
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary suspicious URL pointing to 'gimoguvi.ru'. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it as malicious. The document body, though heavily obfuscated, suggests a lure related to a worksheet, aligning with phishing tactics.

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://gimoguvi.ru/wix?keyword=the+most+dangerous+game+comprehension+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478148/normal_5feb45a514677.pdfIn PDF document text
    • http://zathkatow.xyz/pefugafamifexaq2jp2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_600a59289f97d.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/CujgAha/worm_webnovel_review.pdfIn PDF document text
    • http://soinjaga.ru/what_is_emotional_labor_and_how_does_it_impact_employees6trbf.pdfIn PDF document text
    • http://healsmall.space/macbook_pro_instruction_manual_2017z8iyw.pdfIn PDF document text
    • http://strgb2.ru/marityrvj0.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jRDBgoW/75690232539.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/ljfFgjt/earwax_clinic_london.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_600a6479ca46a.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/kirim_mantra_meaningtuyyv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_6012fdf910c18.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/8d059807-8307-4739-8698-815e381178ca/dilewajego.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_727159e0588d45618d181ca9bda1a6c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd5ab15-d6e4-4184-be3f-70a3ec2eb385/denaniwerusadoromisuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811024a2-ff63-4060-85ca-1b339b3a455d/64961070329.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_933edc031ca24907b1e98904e7493027.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e77521-f38a-4997-894c-feeb139dc8a1/pioneer_deh1300mp_clock_set.pdfIn PDF document text
    • http://tiwazakitu.rf.gd/vinalomixijopaxamaja.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/39996557319.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_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 5560 bytes
SHA-256: 5119157ebe46749062c0fc93c51ef4a31baa17b8a631c2ecd39492dff38f0699
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 10220 bytes
SHA-256: cbffb8f15d6411fbed9de7276095bd01b6cb4949aeb391edc030a885a73c01ee

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