Malicious PDF — malware analysis report

Static analysis result for SHA-256 6051b78fae9b7da4…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 10:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d957084569c5bd8d08b461e1bbd360 SHA-1: 4eb8a9fad75b1c888c2791c964a00ceacb7fbde2 SHA-256: 6051b78fae9b7da406bde9f204552b3d7584197542c2936da3f82dc75bb8e19c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to a book title, reinforcing the lure for search engine traffic. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://zajinet.ru/wix?keyword=modern+database+management+11th+edition+pdf
    • https://cdn.sqhk.co/gixotagokezu/idgggji/26723714481.pdf
    • http://nedavupagisezim.mygamesonline.org/mawoxeg.pdf
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/9333757.pdf
    • https://milalidit.weebly.com/uploads/1/3/1/4/131437162/112ba49cf5.pdf
    • https://cdn.sqhk.co/ravuviwidi/8D3PhbB/69757230160.pdf
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/2476122.pdf
    • http://am-sound.ru/unifi_uap-_ac-_lr_softwareifwbv.pdf
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/e254bf9c9aad42.pdf
    • http://wusozupu.mypressonline.com/jexuletekuzuxusaduku.pdf
    • https://cdn.sqhk.co/moxofudifafi/hjdhb1w/86914573400.pdf
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/1598c11c6e88.pdf
    • http://baltika-trans.com/xezejamirozevunurupeveb66mt3.pdf
    • http://bulubuzigajuzar.getenjoyment.net/80070665183.pdf
    • http://medtechnika1.ru/how_fast_does_mustang_mach_e_chargegr8om.pdf
    • http://smirnoff-optic.com/7336294624717ill.pdf
    • https://cdn.sqhk.co/fejumoraw/6ryiFjd/losexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_aff021386c184b59be9187f784c8c269.pdf?index=true
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_6c11e0f4d8224e89be03f2484f4e4abc.pdf?index=true
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_751c5bbc17014a0faa62afbf79bb631c.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_ec41af4e41b946e3b99c16c0b0866cd7.pdf?index=true
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_49ee086267ec4631bc3fdf9cba3ec41c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f701.bin
25c1826f2970c20dc4c300337c8f72dec3ffdf636c280f9bdb156f2ae442b1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 5620 bytes
font_01_sfnt_off000109fe.bin
b382e1219c9efd2aba6820c4bd0bc94c5550af1a9eea56d6a87ca7f7b69ca6a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 10976 bytes

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