Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc56ffdff79c1883…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 08:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 794938aeb2038ab8595596f298dd8f8d SHA-1: 8141e8de414bca4b76e5ccfc6d98a5776816a25d SHA-256: cc56ffdff79c188302118d2b0bedbd35273d9f699d74ef617d9eccd6aa2e4559
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly-hosted PDF files, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/wix?keyword=real+life+example+of+facilitated+diffusion
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/7690296.pdf
    • https://woviximanikiz.weebly.com/uploads/1/3/4/6/134693880/simirar.pdf
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/099c8d560.pdf
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/5f2af5e898a.pdf
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/1381236.pdf
    • http://jofufunobek.sportsontheweb.net/jofumunikefipinitubutige.pdf
    • https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/8da8df2145b5.pdf
    • http://wubosuvim.22web.org/84895574593.pdf
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/vujujabiparimon-rofikiluwugi-lexixulavubup-pogawimi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jirebonudur/diary_of_a_wimpy_kid_all_books_names.pdf
    • https://s3.amazonaws.com/vaxebisapesi/what_to_do_with_arduino_starter_kit.pdf
    • https://s3.amazonaws.com/rejiner/30944259850.pdf
    • http://toxawilel.epizy.com/tibarabubara.pdf
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_2f60d857d774475a91728695c4f274e0.pdf?index=true
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_98a953fd543e44258818eb8a2d88ef16.pdf?index=true
    • http://nudagimanefej.atwebpages.com/98155113323.pdf
    • http://xuwugufufokiti.epizy.com/how_to_clean_nuby_weighted_straw_cup.pdf
    • http://motojanafit.epizy.com/download_berlitz_english_course.pdf
    • http://rixuroruwe.myartsonline.com/verb_adverb_adjective_noun_exercises.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_3da90f99c08843b5b1f1e2c0f2fecd3e.pdf?index=true
    • http://kapodos.rf.gd/simelebuvatojugojezu.pdf
    • https://s3.amazonaws.com/widofafane/pisokomunalofumomom.pdf
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_2f4d253d955c4a33908475b2f15bf1d5.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_off0000f517.bin
605a6880f00a20cd9d1d4c9053ac6193cf210d98d27b48c83b6e8b5042e12521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 5280 bytes
font_01_sfnt_off0001070e.bin
d6633c6c1fabe6c133f04f16f623ab9ed3138af85edcac0724ea7516e99784e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 10040 bytes

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