Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f13350b499c931…

MALICIOUS

PDF

81.6 KB Created: 2021-03-19 09:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ba401fc8d6360f7d4e954a1c110a3e4a SHA-1: ab6fef3fb1cd6a63f57e22ff67274f39830dd70d SHA-256: e0f13350b499c9317f5980bc886854b024a7c451b638d2e76ce46d10a7d9dc0a
186 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation tactic. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://druttle.ru/wix?keyword=metro+2033+redux+parents+guide PDF link annotation
    • http://zibodotuf.mygamesonline.org/99986026011.pdfIn PDF document text
    • http://vejuwetuk.mypressonline.com/20901021848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc6dbad1f45e.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/gunujose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_6011df4f6f9e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_604918b16e5a4.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/synonyms_and_antonyms_list_for_ielts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_9b100918bf89484eb123738775ca3e84.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_0d56fdb262f546dc98864f87f7148cf1.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_3f394ba7faf34724ad7ff9cc01a9d82d.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d2796e4741494b55a789727b9b6b0fc8.pdf?index=trueIn PDF document text
    • https://b5f62e6e-b620-4b0e-90dd-fa81fc7fb5c2.filesusr.com/ugd/18d815_ff603612d4814386ab796a71afcc8141.pdf?index=trueIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_bfe0c99fc92a490da8c39ac89320b3ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/686200df-c014-4223-b6bd-7c8f30f1db22/mirezobet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d32a47-d284-4910-a7d5-b819871b8241/vimoxavekijugokoruwej.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_2339619530674d53a87b218f3b009d54.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_e86e39a9cf9c4aa783a3bd00e5f8bdda.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_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 5608 bytes
SHA-256: 1c5fa69f5b61490f6de78f904fc95b27e3b2b1e8c52e32aa3a74fb7264c35358
font_01_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 11144 bytes
SHA-256: 93ed184d0466aeb0b6829b66a41cabfcba99970f3086bde3737858c4de594a3c

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