Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa26aba48e72ad3…

MALICIOUS

PDF

69.5 KB Created: 2021-03-23 08:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceca5e30bdb9865cc95dd20cd8ceeb2f SHA-1: 787e105be6e157cb1b9e35718ac80f7fcb133641 SHA-256: 1fa26aba48e72ad31c740135a5e542cb005aa406222ecadc4a13b15bc1a984c0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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
  • 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://resalured.ru/award?keyword=doppler+de+arteria+cerebral+media+pdf
    • https://tolejavufagus.weebly.com/uploads/1/3/1/4/131437822/nawas-zamexo-nejobonotatu.pdf
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/911e56b2.pdf
    • http://pejurazatox.iblogger.org/subject_verb_agreement_worksheets_for_grade_2.pdf
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/ebd756bd0d783.pdf
    • http://damvglaz6.xyz/extra_utilities_2_filteri4ds4.pdf
    • https://fovevirikat.weebly.com/uploads/1/3/0/7/130775443/pozobutetewubo.pdf
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/wemuvinavadikes-pisiwa-matitu-gudave.pdf
    • http://muzesumulel.getenjoyment.net/zezeriwefusatevutel.pdf
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/binunijatulivor-vukotiza-kagemevewir-gebedazeg.pdf
    • http://mifvideo.space/delokolafumu4219l.pdf
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/xilizix.pdf
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/rikogububapax-renanisusum.pdf
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/fivij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tikeresepujel.onlinewebshop.net/change_to_jpg_converter.pdf
    • https://s3.amazonaws.com/gagagakigibapo/off_road_car_games_apk.pdf
    • http://xakagigoneliv.myartsonline.com/what_is_the_magnitude_of_gravitational_force_between_the_earth_and_a_1_kg.pdf
    • http://mofetase.rf.gd/fariduwexalulis.pdf
    • https://s3.amazonaws.com/sefipa/xugojefexaveser.pdf
    • http://wenumamugaru.epizy.com/74018112682.pdf
    • http://sedotet.rf.gd/wununi.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f7.bin
e9093387c0a9d34eea65949c31c9193f71c2aa0c5ad06b6f333c1c3c65d5b03a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 5260 bytes
font_01_sfnt_off0000ebc1.bin
25c3eeac9b4c2444cd94866bddf9dcc2004d3898f711e87c2019b9d5561e28e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 11172 bytes