Malicious PDF — malware analysis report

Static analysis result for SHA-256 5363ad32fba7b30e…

MALICIOUS

PDF

126.1 KB Created: 2021-03-25 00:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22c08bcf91a19ae39a777fc53f84d725 SHA-1: 83c21b188634267625694b5c72d2d796f38fe93e SHA-256: 5363ad32fba7b30eafd16843818d17a0bf9d8276320f050934b0ba9912e99f9a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. One of the primary URLs extracted is https://mezovuduw.ru/123?utm_term=dvt+guidelines+pdf, which is likely the initial lure. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards a phishing or traffic-generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=dvt+guidelines+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fffc106c03a6.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/hieWZhb/100_years_war_battle_of_poitiers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_602d9318d4c55.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/jjCUyes/bible_coloring_pages_adam_and_eve.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/cS2idib/34655311553.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/ihgcbxB/96878882445.pdfIn PDF document text
    • https://cdn.sqhk.co/vonewesipan/gi5jgzp/gopixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_602a19af2f142.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/bhiijbe/lemaretuxanemodun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490127/normal_60118803057d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_60492ff1493bf.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/iiKT0gd/49430261009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1eeb01c2-8e5f-415d-8565-621e29e0290c/27126482679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b934d4-c244-48a2-a606-b454dbfc60d4/kafusibuxuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da069186-2de2-4317-a3d0-f7de2d2c0ef2/common_integrals_of_trig_functions.pdfIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_4c9669d20ed54764a7ea0abb50c3a427.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_b20265b8c6db424cb7f9157fa0341802.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9e9ef0-2cfd-4e47-a026-95266c295530/what_does_visually_aesthetic_mean.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_36ee50164eeb4320aeb95e2188c03c2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6095e4-f697-4b59-b6b4-50d63152274c/77459640768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a54176-415c-4b6d-9f53-2af8fbac1449/what_is_similar_to_wii.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ab96492477c349ce8dd18c9141fc9aba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ad5e8f-4834-4440-ac9c-be1e24f780f1/pentair_superflo_pump_leaking.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7C9 4732 bytes
SHA-256: 3678db9a8286ff486f6b6edbd913853f968463f3e55d9355cf1ee490a496d7de
font_01_sfnt_off0001b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B80B 10684 bytes
SHA-256: 78cb834365b55b1a6f1eefe579cbc9755e884ffb65c8414daa8265787aa37157
font_02_sfnt_off0001dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC29 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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