Malicious PDF — malware analysis report

Static analysis result for SHA-256 555c3780755413d8…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 15:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d67a0d6e677eb8e112825b71ffb2edb SHA-1: 7a1befb02179ff461c737b3d7649726f04ca2070 SHA-256: 555c3780755413d84e9e799850b30773a1ce9512e75499d67d87ebf9398d8756
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded URLs and the PDF structure strongly suggest an attempt to lure users to phishing pages or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/award?keyword=gmp+compliance+audit+pdf PDF link annotation
    • https://vekefusuxi.weebly.com/uploads/1/3/4/7/134714580/6ccda7e150b.pdfIn PDF document text
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/a47694410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_5fd8877fbeec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_6037c95a2af89.pdfIn PDF document text
    • http://vnds-v.website/samsung_c460w_printer_driver_download3dgjf.pdfIn PDF document text
    • http://buloshnaya.site/the_te_of_piglet_downloadpg4f7.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/87geAyJ/97276890583.pdfIn PDF document text
    • https://xupazipul.weebly.com/uploads/1/3/5/3/135325103/kefupaperu.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/ifXibTn/valence_electron_configuration_of_sodium_ion.pdfIn PDF document text
    • https://bowixasexagat.weebly.com/uploads/1/3/4/0/134041419/1927060.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/flgiijT/damogibisuloxigutova.pdfIn PDF document text
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/14622.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/W0wjjia/lorozon.pdfIn PDF document text
    • https://cdn.sqhk.co/daluzowinasu/4MtbhgS/xigozaveligek.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/xuzufuzuvogizeto.pdfIn PDF document text
    • https://birupilanakok.weebly.com/uploads/1/3/4/0/134017156/desujo-wanegabuvoxu-dikun.pdfIn PDF document text
    • https://dodemitewiv.weebly.com/uploads/1/3/1/3/131380707/xonapedadenet_tidifovewawus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_6011b9c42819e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5fd283c4c3ec7.pdfIn PDF document text
    • http://qlemelest.online/50427113626bgc7v.pdfIn PDF document text
    • https://luwosixikitap.weebly.com/uploads/1/3/4/6/134628352/1a313f5b81b2ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_60544134e7023.pdfIn PDF document text
    • http://begdas.fun/avisynth_vhs_effect2u1ik.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/rizezobabub/24211172214.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/gajodil.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/black_satin_cowl_neck_dress_missguided.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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 5056 bytes
SHA-256: 48a40f55874a274d73fb5e629c97e982019b291f81d1fca76868fe326df776e5
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 9932 bytes
SHA-256: 4bc7abe5a2ace74f0e04ab93f6b673332aa3e965a5b83c03100a202ba7b72849