Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a98c5fa2838a4b…

MALICIOUS

PDF

76.3 KB Created: 2021-05-08 08:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4227f36a7eeb1f558a96e0dde439b270 SHA-1: 294315b1e4a0b47a063d8fdee2befadbb4cf15d8 SHA-256: b3a98c5fa2838a4b57af3acc286e61dbdf5156a9fb82a3d71551c711b5e3e485
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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=how+to+write+a+simple+screenplay PDF link annotation
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/c79d985cecfc1.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/7eb3406e7dd.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/jigdhgd/the_ball_adventure_pass_the_seasons.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/cd33c.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/ac39f36934b1f7f.pdfIn PDF document text
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/3700616.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/SidRtXm/ghost_rider_2099_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/hhgfDkp/50369915315.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/walewevazumeg-mibega.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/AkgjiqU/bs_petroleum_engineering_universities_in_pakistan.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/joxavoxerujeru.pdfIn PDF document text
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/relikejava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/simenirixogilakino.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/samsung_s10_android_10_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/ups_changing_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/gugizupagamugif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c98e32-9eea-4e09-a4bb-99a21d504bdf/gopro_hero_4_silver_webcam_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6ea9f8-acc1-445b-b4ea-6a14837e4b73/88141064382.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/fowej.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/60162044031.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/present_perfect_tense_and_past_perfect_tense_exercises_with_answers.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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 5232 bytes
SHA-256: 1b0af4ff1ef39ec31b9ac09e976f3295a012f8cd26ab201939d016bef7f4583f
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10924 bytes
SHA-256: 3849a6c232f2a5e7cd6c5addcc0db5aab9044ea828e464a3200dfeeb771114ee

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