Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf85fe4a6c9c19e9…

MALICIOUS

PDF

74.0 KB Created: 2020-11-13 08:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edd6bfd2efe4220d9e861a4cca866c0d SHA-1: 12fbd2a8f58b4957950672d5ba37e7e609dcd01b SHA-256: bf85fe4a6c9c19e900b6639e2de6599b7055defb4964d584436273a9edde5a60
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'Micro center return policy after 30 days' to entice users to click the malicious links.

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://ggtraff.ru/123?utm_term=micro+center+return+policy+after+30+days
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8d3cee28257.pdf
    • https://cdn-cms.f-static.net/uploads/4407552/normal_5f98dbd3dbfe0.pdf
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f9fcbdf67b63.pdf
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fada936cf34c.pdf
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f9bbc44c2018.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/zegomotagenig.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f94af8ee7a54.pdf
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/639c8fb.pdf
    • https://cdn-cms.f-static.net/uploads/4472768/normal_5fad93e13d182.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e3c78a1e-863b-41df-ab91-73eaa7f37bcb/punujixuwuxanutegeras.pdf
    • https://s3.amazonaws.com/fajonubinomeder/nevusupafepule.pdf
    • https://uploads.strikinglycdn.com/files/2bff4297-6e65-4c6a-9407-03686ab5d29c/terraria_how_to_make_mushroom_biome.pdf
    • https://s3.amazonaws.com/bifamomove/85647605614.pdf
    • https://uploads.strikinglycdn.com/files/ae92d815-7e75-448d-8670-4c8aa2c71682/tibinufusarovoloj.pdf
    • https://uploads.strikinglycdn.com/files/959b2af4-a381-4a53-ad5f-fcc17ed029dc/china_map_png.pdf
    • https://s3.amazonaws.com/gurowozenupifi/28003572185.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e9.bin
6dc8f27b8db85145e619848abf7d91d6612f0e87238141d3a7f33bbb556c1bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 5444 bytes
font_01_sfnt_off0000e87e.bin
59fbabd694bf172e89d76717359176f70d89ec38ca94a03281c0966aa8a9b84a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 10508 bytes
font_02_sfnt_off00010c74.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 4324 bytes

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