Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8696380a25dae5…

MALICIOUS

PDF

79.6 KB Created: 2021-05-31 01:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6769bfa9b5df20bf2f50e5bcc92f0147 SHA-1: 90c3093509f4cb07e7bbf82d40dcb2aa22ed80f0 SHA-256: 7c8696380a25dae5425daccec4371049837f48e37be0b0569298eb7e9669332e
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body and embedded URLs indicate a lure related to PDF manipulation, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the heuristic firings strongly suggest malicious intent through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=regrouper+plusieurs+pages+pdf+en+un+seul+document PDF link annotation
    • https://kabawerabava.weebly.com/uploads/1/3/0/7/130774965/nazumusalek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_60038c03d0f65.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/ganadoliwapipusenar.pdfIn PDF document text
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/rerikepeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_605f8839d541a.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/lunasadi-nilakapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470521/normal_60096a15c36cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389376/normal_5fffffc708fe5.pdfIn PDF document text
    • https://pawigesi.weebly.com/uploads/1/3/5/3/135389203/wegolepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416656/normal_5fc66d1e834e5.pdfIn PDF document text
    • https://saxukenewu.weebly.com/uploads/1/3/4/6/134649668/c67f1ba.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/guxorunu-gorunot-fusaneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_6062735abf962.pdfIn PDF document text
    • https://siridadujaxata.weebly.com/uploads/1/3/0/9/130969300/mekajofuvukodi-tazubeti-vetudibabixodo-dajenuvigofu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3e7968-4614-46b3-8903-8dee7e488c21/xujokewoxinelumimemoxedip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6277c0b-c610-4b02-a9af-c888708be14e/75309241441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc55399-04bc-4606-9646-9b7898cf0e8f/91012110858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec2adaa-e37c-476a-8d7e-fd50e7fec953/augustine_confessions_book_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d200cb-21a9-4a0b-96d8-653b9c45cfd8/lebilupogapejokodalute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f46afe-5cb8-491b-ad5d-e788af4d30f4/timex_expedition_indiglo_wr_50m_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e4234a-fb77-4270-8f71-9c3dfad0ab52/focusrite_scarlett_2i4_driver_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f48595-206c-4670-a096-fc9cdc7fee4f/my_whirlpool_fridge_stopped_cooling.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_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 5484 bytes
SHA-256: 332b4f0d255ad62abf1c434b758c8302cf28bc66be8f8e317de77fffdfd8a156
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 12288 bytes
SHA-256: 6d2c3b71d9e56732654dee635542d67d69ec9981daf02b55f717a2a921e0b64e