Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33c1c640948d5d9…

MALICIOUS

PDF

83.6 KB Created: 2021-02-20 18:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9810ce341bb4edd0d66f5c4bd49627d SHA-1: 9b1582851fa4eef8e5cca7bf86ffe69fe53f697c SHA-256: e33c1c640948d5d929b353345f436086bae865fbc81a8c9a80eca8048ce5fff5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/aws?utm_term=how+to+get+custom+songs+on+oculus+quest+beat+saber
    • https://cdn.sqhk.co/jebavimot/yC2Fje4/bomurajovalagebivibikoki.pdf
    • https://cdn-cms.f-static.net/uploads/4408706/normal_601b8a9bb8547.pdf
    • https://gilamasizate.weebly.com/uploads/1/3/0/7/130775108/9ad88171d63.pdf
    • https://cdn.sqhk.co/fimegasaz/hSwjdge/2020_solar_tax_credit.pdf
    • https://static.s123-cdn-static.com/uploads/4386595/normal_6001407f521e0.pdf
    • https://cdn.sqhk.co/fazituku/jejfqdf/coin_master_free_spins_and_coins_daily.pdf
    • https://cdn.sqhk.co/nojedajoze/s4yRfhj/jowinivanoredok.pdf
    • https://cdn.sqhk.co/tesadubozino/jd5Uojd/street_fighter_4_characters_list.pdf
    • https://cdn-cms.f-static.net/uploads/4479446/normal_602a7b14ee3c5.pdf
    • http://mejarada.iblogger.org/acland_anatomy_free.pdf
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/2959002.pdf
    • https://cdn.sqhk.co/sarodeduz/hgjahi6/juletabiremajozuposapati.pdf
    • https://cdn.sqhk.co/gulaxemetila/ijhhZjf/politics_and_prose_dc_contact.pdf
    • https://cdn-cms.f-static.net/uploads/4420743/normal_602aa978ee6c0.pdf
    • https://cdn.sqhk.co/menasimax/bjj65MD/30_seconds_whatsapp_status_video_download_2018_punjabi.pdf
    • http://<your
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010885.bin
560ee61b6f879ae93e35984c833bc509f9d00bbb2d33f0d707311b016d41139a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 5440 bytes
font_01_sfnt_off00011b03.bin
5ed5ae155963be9cd87179ec751023e6cfa1200b1be809d454ace21466373a14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 11256 bytes

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