Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff082757680b82ba…

MALICIOUS

PDF

69.1 KB Created: 2020-11-21 09:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e28f782ca164a93aca7c161083daa2d8 SHA-1: 81da4075b1ea4807e4b8bfafb694737ca06371a7 SHA-256: ff082757680b82bad45e911723ac89237805c16755fe8c46f5e61fc8df474060
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs point to known malicious redirectors and a link farm, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffmen.ru/123?utm_term=dual+banana+jack+spacing In PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/nugopubunuduxunikap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_5fa71be325a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5fa2c62ba759f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f92ebe96e6e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5f8e17636108c.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/perekiwiki.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/bufipevuril/dujojagawo.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/70224045641.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/36340756908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c353d9-7595-40ef-a344-4b7f90244b83/mikizosuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e939d18d-5f7a-4b1f-bc6b-9ffaa4efa551/realidades_1_capitulo_5a-3.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/borderlands_the_pre_sequel_grinder_recipes_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/23757495319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc0c9ab-d1da-49c8-8d72-1b21aed5844e/burn_helen_hardt_read_online_free.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 5284 bytes
SHA-256: 41954cd7f22bbb8a3f8e2792828bd59284024e198c58c1e1a0f7458d69cef549
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 10496 bytes
SHA-256: cd03052336261a0770f098df0aed3e902e182f16a6198ffdb2d5001963c884ba

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