Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc918591fabd6e9…

MALICIOUS

PDF

81.5 KB Created: 2021-03-27 12:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95d01dfc00031c909ef4dab6da56d146 SHA-1: 111ce81fa570636298ef0e5486a99e4779532640 SHA-256: 5cc918591fabd6e927bf80137222b7b1ec7a4ce1de1b7416ecde70e28cb45ce5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as lures to malicious sites or to download further payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/strik?utm_term=a+doll%2527s+house+character+analysis+nora
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/ab2b17bc.pdf
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/968c81.pdf
    • https://ranefegol.weebly.com/uploads/1/3/4/4/134498511/finiz-jupujaropi-najijiwetig-xazoxipaxot.pdf
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/61ee2860aa9.pdf
    • https://cdn.sqhk.co/pulafefer/jifNgfA/nulomifojarazasij.pdf
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/0a2c16f86d.pdf
    • https://cdn.sqhk.co/dizoketa/YRlRINk/46716650163.pdf
    • https://cdn.sqhk.co/vekuperik/cjdhgge/superhero_skins_for_roblox_boy.pdf
    • https://vunuvuvoxi.weebly.com/uploads/1/3/4/8/134889930/lekudot-dogelazaguguwip-vezijepemoxalev-xewulavas.pdf
    • https://cdn.sqhk.co/tuzojivemepe/PjcBgdi/spider_frog_song_lyrics.pdf
    • https://vewawuwidavejo.weebly.com/uploads/1/3/4/4/134403009/69a75115.pdf
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/7473378.pdf
    • https://cdn.sqhk.co/fujonexa/jhZi1hd/assistive_touch_ios_14_mod_apk.pdf
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/898599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kefefetafij/bunomafibazonenadotef.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_5d9d4d1b00934f09ab3c65043f29b44c.pdf?index=true
    • https://s3.amazonaws.com/bajapovogam/brown_bear_brown_bear_what_do_you_see_free_download.pdf
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_b59e60fe932142efb7524c5ef592d10e.pdf?index=true
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_bc29d24c1466495ea44aa1988341dc33.pdf?index=true
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_ba3758a69fd14c149848296cb36f1cff.pdf?index=true
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_2d690d13c6f640aabf8ac94f6844f483.pdf?index=true
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_37c2cd90209548259ee39238d53cf2d5.pdf?index=true
    • https://s3.amazonaws.com/wupuxus/14612342821.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_23ec5b54901a49d78a319f5e46946744.pdf?index=true
    • https://s3.amazonaws.com/dejazuvorira/25245947306.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_30f1075308f34745b502f4608ac68671.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_off00010109.bin
51d9419322ad9f0df624bfab520a6e270d94b7efd3e5ac9788db9861a3d231f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 5152 bytes
font_01_sfnt_off00011295.bin
34cdf3c16180adbfe6a291fe0d5498c82bee6e0ea90f523a83697221357017e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 11152 bytes