Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d51ea1f9e888a5…

MALICIOUS

PDF

106.9 KB Created: 2021-03-04 16:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3522cc496eaa46a769199e49e2804603 SHA-1: 0fb42e26e99d0b07394b63d8905dbe580becf177 SHA-256: 11d51ea1f9e888a5c555a998085fd37ec3a5177f7912cc7324f946ddec5ca8ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=the+abc+of+real+estate+investing+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468534/normal_6010d3296da7f.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/bolens_lawn_mower_replacement_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489440/normal_5fda8a471ac57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368467/normal_5fee6c835391e.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/ieTjjgj/checkers_game_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/cghij01/mezejabatewuxewijodiwudob.pdfIn PDF document text
    • https://cdn.sqhk.co/zawafolor/9hjjhjf/3d_pixel_art_creator_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalolod.epizy.com/87900296218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad1adbd-7e30-4122-8bc5-942886e3f855/45375640562.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/mega_construx_probuilder_masters_of_the_universe_castle_grayskull.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/xumotukavomutulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ddc2a6-7b6c-49bf-973f-7751e999c8c5/karakigedokokiv.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/geduwofasijize.pdfIn PDF document text
    • http://gidigeja.rf.gd/is_it_true_that_on_your_16th_birthday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478d4916-930d-4188-8b21-90e5bd139066/xegapukazinazifev.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/android_chrome_new_tab_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/asymmetric_information_economics.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_off0001674e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674E 5656 bytes
SHA-256: b55eb1746d4af381b046891f7c850dc98d04362ab19efd2bf51bb6cf465f68c4
font_01_sfnt_off00017a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A94 10524 bytes
SHA-256: b61cdf37eb474ee6bbabc6c4857ba022890b3d0805856243c52314355ea5aff3