Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f322f6c74eb4bdc…

MALICIOUS

PDF

78.8 KB Created: 2021-03-03 09:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f249c3af3d49b2da8d68d024c1d274fb SHA-1: b1918c53a91ca0dceed3e5b8390274be17ffd0e9 SHA-256: 4f322f6c74eb4bdcafaf3d2ead69a8aba29b6d5aa5c1ab2d0c01cc99644b1ed7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=polk+audio+soundbar+and+subwoofer+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5fe98ba97e9c3.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/36f68f56aba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5ff90696c069f.pdfIn PDF document text
    • http://dk-inc.xyz/sizavumajuzifighnf5.pdfIn PDF document text
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/gufof.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/gjcb5tX/vefokufexonolirit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_600c3e653013b.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/tieigf9/giribagowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_602bfa8e191c5.pdfIn PDF document text
    • http://rfs.team/bitcoin_wallet_blockchainpvotz.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/hjhiaih/rpg_maker_sound_effects_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_603253af8782f.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwasusul/eji2ESs/infectious_diseases_treatment.pdfIn PDF document text
    • https://xepinepuro.weebly.com/uploads/1/3/0/9/130969238/1935672.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/8vqgrjd/army_clash_mod_apk_2._4.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/2880327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodudubabafixe.rf.gd/guzowutakamapeli.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 5332 bytes
SHA-256: c21b0ffebeb99789659c7b54bb49d213a92098a68f038fc8d58d278ec7d34096
font_02_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 10752 bytes
SHA-256: 0a0639fe91dcbddd5b7530013f5272d5df77583728bee8923b7994ce321797d0

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