Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3f56bcb8a540aa…

MALICIOUS

PDF

79.6 KB Created: 2021-03-08 02:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3af9c9bb5a769bc00cd3fbf0f99d50fb SHA-1: b3d246113b83ffd0f8e0f821142d806c385f7673 SHA-256: fc3f56bcb8a540aa1d1363bb71422cad8bbc2a6b55f07d629ca3f27b0db9ccb8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of URLs like 'https://mezovuduw.ru/strik?utm_term=is+usps+cheaper+than+ups' suggests a phishing lure related to shipping costs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely 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://mezovuduw.ru/strik?utm_term=is+usps+cheaper+than+ups PDF link annotation
    • http://itdiscounts.pro/fofofunekuz4q6d2.pdfIn PDF document text
    • http://detonic-ro.website/55811459126wg5bu.pdfIn PDF document text
    • https://cdn.sqhk.co/nezosomoji/igAhfih/full_form_of_c._f._r.pdfIn PDF document text
    • http://torchland.xyz/dinililononoj12oes.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/igRieY8/zexozaxawapafud.pdfIn PDF document text
    • http://am-sound.ru/57297452004thchn.pdfIn PDF document text
    • http://iblack.space/aa_12_steps_and_12_traditions_step_1csoui.pdfIn PDF document text
    • http://car-test.pro/difference_between_common_law_and_equityrf58b.pdfIn PDF document text
    • http://cmb-societe.com/total_studio_2_max_review5o5gh.pdfIn PDF document text
    • http://znalomstvavip.site/12349595075x7zxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_879ebb10288149379791e9f85c4501d3.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_50d940f3785c4ec8ab45faa815a756e8.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_a8310e4067d348f3be84dfecd7d5274d.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_ee78db72889140559c8fabbbc44ebaaa.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_b4af406e913043cc9888289bbeb48e52.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_38684ae20fcf4b06874bf20f9b84d04d.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_6a2fa436836a4d46b950321a6eebacf9.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_8385c2566d904abab694c467d95a362f.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_369fc6978b894dc0b8cf32b0bbd19c16.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_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 4928 bytes
SHA-256: 7a92d7c7caf2690a5191c1e734ef9a5a57967a350c518c433fb9ed6708604895
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 11372 bytes
SHA-256: 82e0a85a2c9ae4547d4e7ddbe323acc61ef6dc956e29f7f82aaa22492c450ad2

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