Malicious PDF — malware analysis report

Static analysis result for SHA-256 46527925b883ae4b…

MALICIOUS

PDF

75.9 KB Created: 2021-03-29 07:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e84267dc3a0729ccc9a97ad943663505 SHA-1: 52d0a45af799300f345af4fcfb2df3ec94c4c9cb SHA-256: 46527925b883ae4bbcc5e973feef18af2079f6ecf58f1c6fefdf5250904062f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous external URIs, including one pointing to a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The document body, though heavily corrupted, contains text related to PDF conversion, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=how+to+convert+pdf+to+word+adobe+acrobat+pro PDF link annotation
    • http://xariketixagat.mypressonline.com/muzenekisotutofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601f1e9d65c5a.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/best_short_stories_for_high_school_from_other_countries.pdfIn PDF document text
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/degakexoxemijowix.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/58041035222.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/sowipenazebez.pdfIn PDF document text
    • http://fuzuwozozat.mypressonline.com/72841529196.pdfIn PDF document text
    • http://wtia.space/samsung_soundbar_hw-j450_specst50vs.pdfIn PDF document text
    • http://whowill.ru/theta_healing_training_nycb3y7u.pdfIn PDF document text
    • http://italysummer.fun/mukesobazultc19.pdfIn PDF document text
    • https://vezisadorudaruj.weebly.com/uploads/1/3/4/3/134349324/bodegavifabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/quran_surah_yusuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/89752209806.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/brainwashing_books.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/can_t_hurt_me_goggins.pdfIn PDF document text
    • http://negumigimewote.onlinewebshop.net/pre_engineered_buildings_design.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/54324644064.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/ziseramajamatikare.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5192 bytes
SHA-256: 3861e00bf7dab18c0e1d73ca61d042068cccb8310dd12556ae06b1b883e09f40
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 10780 bytes
SHA-256: 2606b9c801688e0294c1b1a0645e85dfe4b91272eb5af90ce815816394a085db

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