Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87618cf8062f050…

MALICIOUS

PDF

77.7 KB Created: 2021-06-01 03:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be556830a78851b49f93a1b33db05bba SHA-1: 284edf13d41f99b8fc942bd67754165b5d678d6e SHA-256: c87618cf8062f050d58badf21e60266330b893bf0c886935768caf52622af447
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting numerous external links under the guise of free software downloads. The primary URL, https://philabc.ru/pbw?utm_term=super+mario+bros+games+free+download+for+windows+xp+full+version, is a clear indicator of a phishing or malware distribution attempt. The presence of a large number of external links, many hosted on disposable domains, further supports this assessment. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/pbw?utm_term=super+mario+bros+games+free+download+for+windows+xp+full+version
    • https://tesokumerapaj.weebly.com/uploads/1/3/4/5/134522001/8212067.pdf
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/karopasebowopud.pdf
    • https://cdn-cms.f-static.net/uploads/4374847/normal_600a722da5bf3.pdf
    • https://defireser.weebly.com/uploads/1/3/4/3/134347292/sulejowetezip_semojum.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/lonaxetug.pdf
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/sunamokuvigamep.pdf
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/dumupakegedizivale.pdf
    • https://jumazege.weebly.com/uploads/1/3/1/6/131606101/bonepovaxi.pdf
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/kozis.pdf
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/5408691.pdf
    • https://lukizodik.weebly.com/uploads/1/3/4/4/134458766/1777594.pdf
    • https://nevetutofipodel.weebly.com/uploads/1/3/4/6/134600430/6124097.pdf
    • https://virebutonoku.weebly.com/uploads/1/3/4/4/134486614/kodon.pdf
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/9362940.pdf
    • https://dilaxala.weebly.com/uploads/1/3/4/8/134865885/gidodov.pdf
    • https://static.s123-cdn-static.com/uploads/4426551/normal_5fce4e0ee85ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://veweran.pbworks.com/w/file/fetch/144434595/sudulalajuminosi.pdf
    • http://negovijalulu.pbworks.com/f/how_does_scout_describe_mrs_dubose.pdf
    • http://ziduzobif.pbworks.com/f/raxet.pdf
    • http://gazumadu.pbworks.com/w/file/fetch/144436500/the_boss_baby_full_movie_download_in_tamilyogi.pdf
    • http://gatasulupu.pbworks.com/w/file/fetch/144411621/47208483878.pdf
    • http://sijomirurefi.pbworks.com/w/file/fetch/144431397/84215452536.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144420204/baby_corn_snake_feeding_schedule.pdf
    • http://sepaxebi.pbworks.com/w/file/fetch/144419151/wewomiw.pdf
    • http://zikasamu.pbworks.com/f/43749970812.pdf
    • 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_off0000ef29.bin
2162655981b6add1c08209036114944d3982596e7b0007aea488c6efdb1ba3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 5824 bytes
font_01_sfnt_off000102f5.bin
95d2d1d38c4b6969a3f68748eb1f9cac86f31cc51a0244273a1bf0e2bfccf23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 10916 bytes

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