Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73e5d32ee466a06…

MALICIOUS

PDF

74.1 KB Created: 2021-02-25 21:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7deafc77458f52a0de210911ad55fbe1 SHA-1: 641e6de9e68bb786a43a243024d90fc33f30caa1 SHA-256: c73e5d32ee466a06466abaa706ead6a2cc227f3d3563b6387a0e1c814ae1bc54
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure point towards an attempt to distribute further malware or phish for information.

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 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.
  • 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.
  • 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://maypoin.ru/wix?keyword=4.1+studying+atoms+answers PDF link annotation
    • https://cdn.sqhk.co/zivunegas/fdErDge/bingo_smash_lucky_bingo_travel.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/jibiranifa-jolulupid-bozixetikisane.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/czaD8HI/76681572952.pdfIn PDF document text
    • http://workshop-fb.ru/melodiwebirejepjmdl.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/gjjbhfp/93983132687.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/5267490.pdfIn PDF document text
    • http://blognews.top/lelavabewotapenarulibalazz1920.pdfIn PDF document text
    • http://a-trvl.ru/rowuxenevisuron0c08.pdfIn PDF document text
    • https://cdn.sqhk.co/pubabolab/je2Hhdj/real_traffic_racing_car_city_hack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/Lja6hc4/zibofasapa.pdfIn PDF document text
    • http://walletelectrum.buzz/assignment_marks_form_aiouq0x53.pdfIn PDF document text
    • http://itslm.fun/vegadagetubefajaniluko4aaxr.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/MO3icEm/royal_battletown_mod_apk_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowuzapifara.rf.gd/bhojpuri_video_karne_wala_apps.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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5384 bytes
SHA-256: 49b87c0fdf0514d57c8b60587121da3c6642448fffd551aca1379c99ef60f7de
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 10688 bytes
SHA-256: e26ebcd4b264b5139c9b3698a2ae89de4ac0eeefa61c74cb7a31353b7f9861cd

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