Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cdd88ca158eac5…

MALICIOUS

PDF

97.7 KB Created: 2021-03-27 20:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a1bdd0323d48c19d20b43476ad632f3 SHA-1: 797484a8f1f2413a91fd1dfd79ace1903e806b5b SHA-256: d3cdd88ca158eac572cc979414789e07493c7f4da7df477764f05111f7ff2a80
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The primary URL, https://resalured.ru/strik?utm_term=how+to+deal+with+being+upset+at+work, suggests a lure related to workplace issues, likely to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=how+to+deal+with+being+upset+at+work PDF link annotation
    • https://cdn.sqhk.co/towojutal/6qihjdB/74906831356.pdfIn PDF document text
    • http://zebolalifitu.22web.org/black_and_decker_3_in_1_waffle_maker_recipes.pdfIn PDF document text
    • http://nafugelinev.iblogger.org/melewegotosixanigazodij.pdfIn PDF document text
    • https://damafurota.weebly.com/uploads/1/3/5/3/135337485/4669758.pdfIn PDF document text
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/992e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_6058f8bc13ff4.pdfIn PDF document text
    • http://vofovadero.22web.org/asthma_predictive_index.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_601e109fd808d.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/hcbunjd/vaxix.pdfIn PDF document text
    • https://kotazadan.weebly.com/uploads/1/3/4/3/134349323/xekoxeli.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/dZMLzhe/82852936901.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/fVbjiK4/romancing_saga_2_vs_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxoretubobo.rf.gd/flash_pasteurization.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_d19a272db975499d8e6696fa0640462e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d46d5b-cfc4-4fed-a8b3-f3d77dce3419/64421394296.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_80bd723fedd448ea974c09ba98343461.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd1f190-fb9b-4923-acfb-7588a7932299/tappan_stove_oven_not_working.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_4fee36278bc34987a384a62d33282f6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/508d92aa-bf33-4780-88f0-5b0fd406b3a3/how_many_calories_in_a_nacho_fry_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c387ab-1c5f-4840-906b-cc276e1de53a/what_does_fascial_stretch_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e73007-bed9-4640-a9f2-c01aa2ff2b8b/1806435497.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_f37f564b6f1744f4ae8130a792fcb26d.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_855b4937a9144a72a4339c49ddbc4de9.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_off00014259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14259 5476 bytes
SHA-256: b756529aaa9bf26091618a79969fde961ee8771516fcb62854b2b411f32cb23d
font_01_sfnt_off000154f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F9 10672 bytes
SHA-256: a7ae34cdd6f5bcf25a8d0fe1347dedc0a70c32144276ee5e7c3a1b2aad17926c