Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9acb8ead7e138e…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 14:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e87cabd0cba19f73f6ae03d341104263 SHA-1: 0b28a09f35ba22491bfbc741b3709fbf303de80d SHA-256: 1a9acb8ead7e138e4e912b42e638729633d995547c57694a511d8560b3118b06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=cpm+algebra+connections+answer+key PDF link annotation
    • http://universe1.space/early_bird_gets_the_worm_meaning_urban_dictionaryr82fq.pdfIn PDF document text
    • http://123dutch.com/68499616750fml3k.pdfIn PDF document text
    • http://instup.xyz/business_standard_newspaper_epaper1bja8.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/fpK9WWp/43985840457.pdfIn PDF document text
    • http://curvepreloved.com/dududofumigabusifh0gu.pdfIn PDF document text
    • http://ketosimple.online/msvcp140_dll_windows_8_freevt1km.pdfIn PDF document text
    • http://shtampshop.ru/strugatsky_roadside_picnic_audiobookwio8b.pdfIn PDF document text
    • https://cdn.sqhk.co/vugiboba/hhc7geH/yeezy_700_v3_arzareth_glow_in_the_dark.pdfIn PDF document text
    • http://nikaold.site/safusowipinijorakizuxahzdbb.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/iFL4heZ/gorabavobegego.pdfIn PDF document text
    • http://salonop.xyz/casio_fx-_991ex_user_manualpmiwm.pdfIn PDF document text
    • http://odemebayisitrafik.com/final_fantasy_xvi_trailer_download416hj.pdfIn PDF document text
    • http://thepropheticapp.com/178439984238hqyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/powuwuwo.pdfIn PDF document text
    • http://damokoz.epizy.com/jigado.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/bstc_paper_2019_ki_answer_key.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 5556 bytes
SHA-256: 686cc7c5b4305d1f0e2d4492ed11912c172690b8c0aa7b1865fcce22605c463f
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 10020 bytes
SHA-256: 23d260ea2d04f206708396db0c24c216f2d97d91503b12ce4013ea862db2aaa3

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