Malicious PDF — malware analysis report

Static analysis result for SHA-256 16508f19094ba369…

MALICIOUS

PDF

77.5 KB Created: 2021-01-17 10:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2d9fa5fced0c6fdebf00fb58c6696d51 SHA-1: 30b101950e1ca6103f46614ffc2783072ffb6f05 SHA-256: 16508f19094ba369563550de65665dd28cdceef7e4cb38b1ca88e1b57829d318
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to 'English vocabulary about food pdf'. No scripts were extracted, but the presence of numerous external URLs indicates a redirection chain, likely leading to malicious content or phishing pages.

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://traffnew.ru/aws?utm_term=english+vocabulary+about+food+pdf PDF link annotation
    • https://mitamegupep.weebly.com/uploads/1/3/2/3/132302953/3b4246fea00.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/I0hbHI9/sandeep_maheshwari_s_wife_name_and_photos.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/depujefobabakutozuvow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f8d8e235036f.pdfIn PDF document text
    • https://site-1178275.mozfiles.com/files/1178275/detege.pdfIn PDF document text
    • https://site-1172346.mozfiles.com/files/1172346/gosumefi.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/4928048838.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/8636482.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/7ibu1i5/90084842435.pdfIn PDF document text
    • https://site-1180426.mozfiles.com/files/1180426/sky_warrior_bahamas_ltd_address.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5fbf3a2152461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5fbbb10150b25.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/MggJgeW/background_remover_high_quality.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/Qq5ojca/headmasters_barber_shop_county_galway.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/XRpGVUJ/jikiletulanosakadomabu.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/6KEhckD/celestial_meaning_in_hebrew.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/piedggo/rusepozavobome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pobixedele/10416332710.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5676 bytes
SHA-256: a6c953bc60da605248664aca3812a9c8f712cb00725c440ed3c7bc1c8493afde
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10896 bytes
SHA-256: 55232ae71b0cd02c358629c23c5b49edfaa831fd882da4b3f2c10609a8107730

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