Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d5dd76a9540f57…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 16:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b77aea396f653f9f4647bc3a420acde6 SHA-1: 5c4d38ca25687a3d5ccb8f79e45658927933f8ca SHA-256: 36d5dd76a9540f57e2f87194c4c2b4389638f421b659bc9404881716bd1018a4
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to a 'manager manual' and a specific model number, likely a lure for a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=fcb1010+manager+manual PDF link annotation
    • http://vuvefezod.iblogger.org/guguvatef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_600bda1231b5b.pdfIn PDF document text
    • http://goldotzyv.ru/912237980588lkrq.pdfIn PDF document text
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/7441311.pdfIn PDF document text
    • http://hotgirls.host/513987925561d9eg.pdfIn PDF document text
    • http://metinozub.iblogger.org/beauty_supply_store_business_plan_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fcc7dddd1193.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/c6ec6bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fcf337dcf285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_6033caf882560.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://jalovunenenema.epizy.com/autoformation_windev_17.pdfIn PDF document text
    • http://dipijiz.epizy.com/kuxopufufokevusuvebavewi.pdfIn PDF document text
    • http://pixividazexew.epizy.com/40295926589.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/39774077521.pdfIn PDF document text
    • http://nenilezum.epizy.com/37327573083.pdfIn PDF document text
    • http://dojopugoput.epizy.com/jenuwinovifumefofuzirarid.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/92462203190.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/feed_conversion_ratio_in_poultry.pdfIn PDF document text
    • http://sulorunak.rf.gd/chapter_24_studying_the_sun_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/latex_format_c_code.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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 4872 bytes
SHA-256: 13d96804e4d0dabe1a72a94f601c4c9c618f5970e7d825d4de7c6372cf6e27e8
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 10304 bytes
SHA-256: a28b983cc8dd525f5fdd8dddc05caff043f95585031c198dd6ebc7efc8194b6b
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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