Malicious PDF — malware analysis report

Static analysis result for SHA-256 0327a1622aff7308…

MALICIOUS

PDF

80.0 KB Created: 2021-03-26 07:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45800279fe00d114de2cc085d525a770 SHA-1: 9085576762f1316da76bfe16497e816fe99e5f43 SHA-256: 0327a1622aff73085687b848082b0870bf5b65e3296d95eef3bbed5236683e59
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its structure, which contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of numerous external URLs, including one identified as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=building+winning+algorithmic+trading+systems+website+pdf
    • http://submonster.xyz/13876513415iy2xm.pdf
    • http://xovitixekewelom.scienceontheweb.net/86339613500.pdf
    • https://cdn-cms.f-static.net/uploads/4371023/normal_602ffa7d89e95.pdf
    • http://powerpoint4you.ru/fun_self_portrait_ideas_drawingt1kp6.pdf
    • http://8bitbeardsco.com/how_to_replace_battery_in_swiffer_wet_jetculeo.pdf
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5fc9dfa78c8cf.pdf
    • http://nabavawuzafurur.mygamesonline.org/18132883949.pdf
    • http://mojofaza.mypressonline.com/solved_accountancy_project_for_class_12_cbse.pdf
    • http://cardioactiveitalia.site/mentors_ielts_bookh0w21.pdf
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fe3aa01036d6.pdf
    • http://callup.today/70889418237o4gyz.pdf
    • http://kuliwegi.sportsontheweb.net/bovufexivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_3d47a98d44344c02a06fa9d0ff9a2de1.pdf?index=true
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_a85227651d75469393f26b650d17ea5f.pdf?index=true
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_15f82e6768bf4c27a28b974bd65e2d35.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_a0f443f8f4d04f11b027414cbe9b166c.pdf?index=true
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_bfaee18f99424704bbba6865c3b956b7.pdf?index=true
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_b4e4f3a413144764bda9688ca42969da.pdf?index=true
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_98ce9f747d144dc380b808535a4224ba.pdf?index=true
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_7abeb63e5dd245598ad4f747fefdaa16.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_7088bb01e28f42fcb3a387edc5df082c.pdf?index=true
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_cd0c4d9d2b0f4fbbbec9ed56c6ae7827.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_7e8664194471458ea607ddbbc8b47a0b.pdf?index=true
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_a9b3dccd12dd4a9290533dc2da8c1c18.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c5.bin
15d2f2304323685fcb045d14714c78abe9cdb5e300a6cdfa8aac1901cbfe3752		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 5952 bytes
font_01_sfnt_off000109f4.bin
32452c4502bc1f05278f4aec0b1538c5396f9237097c9c1ce71d16b201e896bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 11004 bytes

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