Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e8dae063a51fb7…

MALICIOUS

PDF

88.0 KB Created: 2021-05-09 15:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 274fa102f93e6216e2912b63da0ec534 SHA-1: 401d62c84a222d3e41b3721250e66416f7b31146 SHA-256: a9e8dae063a51fb74e6b94060fac90e79d359bffea4ed8fb3b35c52a0b0f322f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm, with ClamAV detecting it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=to+feel+fine+synonym In PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/9f91ce8bca055e7.pdfIn PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/e82ccc7bf.pdfIn PDF document text
    • http://idealslimitalia-official.site/m5a78l-m_lx_plus_manual0ku57.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/8dcf2d8.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/68644085294lc8v2.pdfIn PDF document text
    • https://kazimiposaduvab.weebly.com/uploads/1/3/1/1/131163956/xukusefozojoxarofe.pdfIn PDF document text
    • http://seamanygau.best/alchemy_guide_1-_300_hordedc96o.pdfIn PDF document text
    • http://erogan-oficial.site/kaxodejurelemerevuwik1bql.pdfIn PDF document text
    • http://joblanc.xyz/zekikakopoxupewelozusannoefu.pdfIn PDF document text
    • http://giwosesupalu.medianewsonline.com/cement_plant_working_process.pdfIn PDF document text
    • http://paxabak.mypressonline.com/wedifelebimemaxufogip.pdfIn PDF document text
    • http://petersikdar.com/event_planner_website_template_themeforestgzt3s.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/badb6b5.pdfIn PDF document text
    • http://activa-fb.com/niferegotiximerijazunori0fxnj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0e8cdab2-6bec-4d45-b85b-1dbb0f2a5e2a/factory_reset_wd_my_cloud_ex2_ultra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db065772-5609-4ece-978e-a117843d48c5/rinnai_ruc98i_service_manual.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_08a041e59eed4158951b81f8c19a88e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cc906e-b320-40a4-a5d6-4ce3cd5c04c4/xesonavogibemazez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c968808-3348-427c-a306-700c53d0e7c9/30420363211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdd320f-d1b9-43f3-a296-2eb175bfd0c6/what_foods_have_lots_of_calories.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_fb576e6f338348b3a47ac124400d72fa.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 4368 bytes
SHA-256: af4205605b0fa3ab0e392faad2b0f7c08683d335eeec0a50684f325328b32cd9
font_01_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 11292 bytes
SHA-256: 79167f036f27ee69cdf8afa10bc97a76c0ae2a5d79e0a6ffd05521bd3ce83736
font_02_sfnt_off000144da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176