Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fed586383c388f…

MALICIOUS

PDF

84.3 KB Created: 2021-04-01 23:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 071be9d3a95858ecc256b3b6008be271 SHA-1: 5267e6cb398dc8d66b128c7e7e674d0d41b33d2b SHA-256: 80fed586383c388f875bf715cb28b695a1487e28c7c579b3ea8752ef360b0344
132 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to an employment application. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=employment+application+form+pdf In PDF document text
    • http://ketousa.site/coldest_place_in_usa_right_now_2019dfshh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_605f280cda215.pdfIn PDF document text
    • http://trelon.fun/7556137622dnohm.pdfIn PDF document text
    • http://feedbacrnz.space/activator_windows_10_enterprise_32_bitmez6o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5ff91fd6b9b5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5fc8d211c9040.pdfIn PDF document text
    • http://mavito.online/dimplex_electric_baseboard_heater_manuallewak.pdfIn PDF document text
    • http://sweetygirl.club/hp_officejet_pro_7740_user_manualrq9lt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454562/normal_5ff8c4276f323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5ff760c88e53b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383688/normal_60009a572131d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_602e0326c5d70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_6013e1a1f30b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5ffaaf6c5217b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_601494da8d72e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_605027a2800ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6012db2c16963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_5eaf1ef7e07f40a09b1ec0502865cee0.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_dbab4f42705748ac9d7bf22dcc1d3167.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_fb568bfde0a1447e8baa74eb6d456cbe.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_843a19e11bc44f22a1566993e89ca8ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/taco_bell_hard_shell_taco_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/serigefurewisoxolelanuzax.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/lixilepajufekaguf.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/pafaxabipamovezewixe.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/wamigisejexilu.pdfIn PDF document text
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_c6319587f9c545f0ae52c70e3f597eb0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 5180 bytes
SHA-256: a61c5866288c44bb3b83d0f3d52d459225d9f264f83abd58e42b250c9e73aac4
font_01_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 11484 bytes
SHA-256: 7d1777cad48674357b09f2dd9ac8e29de34e6e5ffb191f5cbf492cf6638a2c6c

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