Malicious PDF — malware analysis report

Static analysis result for SHA-256 53679362c73f0db6…

MALICIOUS

PDF

70.9 KB Created: 2021-01-21 13:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1ecc9593b89873d157361656057c7950 SHA-1: 1eeac1ace4ba048371870c274a81495d43c5eada SHA-256: 53679362c73f0db6499a54ec2cc8b1d0d29c0dac7bc4089b44c801d78c326a35
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with 'traffking.ru' and a weebly.com URL being prominent examples. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', suggesting it was generated by a tool that can create PDFs from web content, potentially to disguise its true purpose as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=la+cocina+de+la+escritura PDF link annotation
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/5139179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fe302b7daffb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5fc43f3c99abf.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/2437921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5fb9f74ad0f15.pdfIn PDF document text
    • http://dimukidiri.iblogger.org/gulosanojudajigudo.pdfIn PDF document text
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/xuraje.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/paropabaru/67990219933.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/8297691948.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/bleacher_report_pro_football_picks.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/77372615196.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/rowipobovoferupaverivi.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/mexoboparapunovorutik.pdfIn PDF document text
    • http://kasanuvuwa.epizy.com/botola_live_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/fakilun.pdfIn PDF document text
    • http://wukefomirufiza.rf.gd/ribewonikibukafirukadasas.pdfIn PDF document text
    • http://kujafugakare.epizy.com/82660583092.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/28971492221.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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 4876 bytes
SHA-256: 5c1adc34c9c9653806d1b9f5084f7dd324efaebf3dad270c2fc20ad2938abe20
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 12036 bytes
SHA-256: ebc1a129dda02a39bedb7d54bd0cb922e1605451bf0486e2bcc6a0506007142a

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