Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4694ae64e84c113…

MALICIOUS

PDF

82.2 KB Created: 2021-03-02 15:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1adcb5b6e19b0bbc96989a13c40e4c5c SHA-1: 747ec2513126a27ca0f4eeb7e3d78bb0181a4b01 SHA-256: c4694ae64e84c1139cc30c5675729932127132e114fa07195af0d9dd0a4a1384
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, indicating it functions as a link farm. The primary URL, https://jottigo.ru/award?keyword=echo+srm+230+carburetor+problems, suggests a potential SEO scam or phishing lure. No scripts were extracted, but the PDF structure itself facilitates the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=echo+srm+230+carburetor+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408989/normal_601cf86579910.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/rojubutitufefa.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/67791991100.pdfIn PDF document text
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/5705363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fcde50f26ef9.pdfIn PDF document text
    • https://tubufuximenijo.weebly.com/uploads/1/3/5/3/135304690/31c64d141463.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/egfJkia/hidden_ball_pitch_baseball.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/buditekezizumam.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/Ujaghhb/tuzemivozoturilub.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/e8Ugghg/occidental_heroes_crossbow.pdfIn PDF document text
    • https://jovopunok.weebly.com/uploads/1/3/4/8/134869647/pipawirodaxesutukibe.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/lokijuronig/altova_xmlspy_2016_professional_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/baby_laughing_ringtone_wapking.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/facttechz_brain_booster_app_free.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/54477663835.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/93546944180.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/52894001400.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 5708 bytes
SHA-256: e3bedc0e0474c636fdec0b9146c99293cc0c06d8e828915a0a94d1ed3486ae8a
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 10664 bytes
SHA-256: b1a60f9c3d457392e481fef8ad3ae93c0a1a52d2a6785ee0d0b0c4e5461e61d7

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