Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fe71bd70acdc3d…

MALICIOUS

PDF

82.2 KB Created: 2021-04-06 02:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1861a72a0e8a597f202034b8832fc584 SHA-1: c012f26b1f65230bb47c9b23170b4ff1684a45c5 SHA-256: 49fe71bd70acdc3d83850728353b674d7789beff51a64d3681c8775443c0e2ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, contains text related to a news report, likely a lure to encourage clicks on the embedded URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/123?utm_term=cnn+report+on+el+paso+shooting PDF link annotation
    • https://cdn.sqhk.co/jotapepikota/Yjbgthi/68203452582.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/jj3gcDg/futuwisilefokofag.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Zhd0pUm/7151250059.pdfIn PDF document text
    • https://cdn.sqhk.co/viposaxa/WrI6ujf/88021150293.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifapig.epizy.com/how_to_make_fake_blood_cancer_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8116436-56f5-4e07-976e-4530efd711f5/27409385627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dd584b-b086-402e-9db6-13547340147e/62845795871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6609ff5d-24e9-46ea-875d-0dadb5178d3b/buzuwi.pdfIn PDF document text
    • http://fuwasal.rf.gd/astable_operation_of_555_timer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e247ab-019b-458e-a57b-5285b3e85e9b/how_to_fix_your_lawn_mower_if_it_wont_start.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_b79fadd1f21743bda3924fe8e08dfdfb.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_e522363273904971b1849be995da091d.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_832d648f5bf7490cae2350c921844ebb.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_570d9554094140af9bdfa582dd500688.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_fb489263cd6b4d1fa30e1d6da60e1f05.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_0d3d0ef5c8d24596a31b48d487875b2d.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_3528e4152c3c4c94905c338c3652c2e8.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_7bc8bda7057a4913ac5179a69a3cae10.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_80b3e394a54146e4b0536a93d8884a29.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_1e5e76f6e59c4df188cad9adee9561e0.pdf?index=trueIn PDF document text
    • http://latopoladizewel.rf.gd/geronimo_stilton_author.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 4988 bytes
SHA-256: 4bd07fdea6df47477cac5d6a8436176ee44ee9de36bb06524a9b6bfeae9e5c61
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 11788 bytes
SHA-256: da23a88bc7dc890a4093501df319e3f2ac268a6b0399ea5ba9151c449289b24e
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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