Malicious PDF — malware analysis report

Static analysis result for SHA-256 752442f4ceff81ab…

MALICIOUS

PDF

101.6 KB Created: 2021-03-21 02:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac6be930f819cc7483d5762df59eef83 SHA-1: d633ec65518891fdf5c0bfe37c319c4ef528851d SHA-256: 752442f4ceff81abfcbfbe94f549ccc59e6ff3b431df6d758cc660d1382008cb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points towards a content-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ponafet.ru/aws?utm_term=peavey+classic+30+112+tube+combo+amp+review
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/6984345.pdf
    • https://cdn-cms.f-static.net/uploads/4462096/normal_602ae74f17564.pdf
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/bizujuweli-vufowux.pdf
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fe3da5a67aeb.pdf
    • https://cdn-cms.f-static.net/uploads/4470412/normal_6036db20e2a68.pdf
    • https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/wosabe.pdf
    • https://bofewake.weebly.com/uploads/1/3/4/6/134695903/52ed94bfa3.pdf
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/fugovorajoge.pdf
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/df0a8d6.pdf
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fd10d91762c6.pdf
    • https://cdn-cms.f-static.net/uploads/4448129/normal_6018d40a3c6a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zuwosil/kobalt_7_1_4_miter_saw_replacement_parts.pdf
    • https://s3.amazonaws.com/zopenave/74660194674.pdf
    • https://s3.amazonaws.com/xutomoxu/rcbs_chargemaster_lite_vs_hornady_auto_charge_pro.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_4e3a78a2e0e5432d84a782f1781d15c2.pdf?index=true
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_5f7fecebadaa4cf4bb6d6673e3b43f2e.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_e23dc912cd3241cdbf6cd6a8f802062f.pdf?index=true
    • https://s3.amazonaws.com/fezenur/rividote.pdf
    • https://s3.amazonaws.com/liwafo/pemumudapevogabik.pdf
    • https://s3.amazonaws.com/jubiferekaka/35320079508.pdf
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_742c0176a5d840b9bdcabe8d6ef4e923.pdf?index=true
    • https://s3.amazonaws.com/xidazeze/mother_tongue_essay_by_amy_tan_answers.pdf
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_7832282e216e483e9dcfa7d9f8f93b1b.pdf?index=true
    • https://s3.amazonaws.com/zarevizebi/list_of_ar_er_and_ir_verbs_in_spanish.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001403e.bin
cea0d0e73c0ba95d6292e8a67227f88103a8654a6355b2d2a3e0035e658d5123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1403E 5740 bytes
font_01_sfnt_off000153de.bin
ed65152a9e90432cbd8b44463b3a68977742690ce93d102831d06f0cd9832bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153DE 11240 bytes
font_02_sfnt_off000179e5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179E5 4324 bytes

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