Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc99eb5827f1eb82…

MALICIOUS

PDF

75.2 KB Created: 2021-03-27 16:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 861f084b3fb3885ae049aa85e05ef85e SHA-1: 9d40c198e23ff42c09316afacb446a7e32488188 SHA-256: cc99eb5827f1eb82d77a378ad9843dcce9e13bddba002ac4e9061b40b013e444
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://xajibur.ru/wix?keyword=android+oreo+8.1+apk+download
    • http://wozilimesiz.mypressonline.com/data_analysis_in_social_research.pdf
    • https://cdn.sqhk.co/jipuxoxukul/bidjaHA/18179093523.pdf
    • http://wowogobofomufu.mygamesonline.org/antipsychotics_classification.pdf
    • http://noxaduva.mypressonline.com/70659735123.pdf
    • https://cdn-cms.f-static.net/uploads/4458145/normal_60247e9ff2edb.pdf
    • http://trychambre.xyz/diablo_2_lord_of_destruction_best_classa0f0c.pdf
    • https://cdn.sqhk.co/mawodoso/jjwgjjc/add_prepaid_gift_card_to_paypal_balance.pdf
    • http://jushq.pro/timezasomexgpa.pdf
    • https://cdn.sqhk.co/zolewiko/aO2P2gc/33017966751.pdf
    • http://vowewudimo.mypressonline.com/vowumotinolip.pdf
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fd1863b1cacf.pdf
    • https://static.s123-cdn-static.com/uploads/4450043/normal_5ffe2aa7e64a1.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd8b194f267e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_d606d50e5c0a460fbcd2748ddb2396f5.pdf?index=true
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_2177d15225aa4659a83cd9eb5d041203.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_8c861d7164894af7a258459c4a3dc7b8.pdf?index=true
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_c3752975e22345fbbc7b332a7b9395b4.pdf?index=true
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_94d369eb6dc743f5a021039bc82e7085.pdf?index=true
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_9c3925a306fb432c813991bb777b35f5.pdf?index=true
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_d13ee4d942ed45ee925c08fac8ce5341.pdf?index=true
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_9cab0aff8de24b5194642e7595a4c372.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_ea58fca1f37045a68dfa819816877e72.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdab.bin
9b1a855931dd092fecd824240090e1a05bbaed643cce0c9caf526eb3661e747a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 5200 bytes
font_01_sfnt_off0000df8c.bin
79704727ae2361499508c48a63248529466b6651b643e125f15ef08a6eb6c792
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 14252 bytes
font_02_sfnt_off000108ca.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 16092 bytes