Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c153f6a2837c2d…

MALICIOUS

PDF

71.9 KB Created: 2021-03-14 22:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3701854b1d4634860a323560366ebde5 SHA-1: 9b90aa03207edb425ffe1d5050dcbb81bc6186f1 SHA-256: a1c153f6a2837c2db105c765ebd8b33765b3c212b17081c38805b299b35f4666
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://ponafet.ru/strik?utm_term=a+kingdom+of+dreams+audiobook PDF link annotation
    • http://tapasin.sportsontheweb.net/atomic_weight_of_elements_list.pdfIn PDF document text
    • http://yesstore.pro/81256484874zuf5.pdfIn PDF document text
    • http://internet-babki.ru/sifepiwuzezaga3rk03.pdfIn PDF document text
    • http://itabody.space/bipikufetegigaxuxirukaru0wl0a.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/bizamo.pdfIn PDF document text
    • http://fullpisetc.ru/road_racing_car_racing_25xlzg.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/parametric_modeling_with_autodesk_fusion_360.pdfIn PDF document text
    • http://businesslinecenter.com/schaums_outlines_differential_equations5nd8t.pdfIn PDF document text
    • http://lifelalulenomip.mygamesonline.org/45811040252.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/96862611676.pdfIn PDF document text
    • http://pelobana.66ghz.com/kupuxutemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_be46045c06554ea08e84f2ddf98d7650.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2346d265-a3a9-4b7e-981d-0d12c20f5fb6/xotoravukitelonopofag.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/esperanza_rising_book_online_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7305caf-3721-4ec6-b504-9092cf4cf397/when_to_use_and_cdf_statistics.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_1b3abf1141c04fed9224ee00be4bbdaf.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_e6522b8a054c419b8e890872419b56ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/663ef145-d12a-402f-8e96-d042dd142d5a/zagegapijixem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe03e33e-852f-4984-ab52-ec28dbedcc88/pumasopibagaxaf.pdfIn PDF document text
    • http://zexikewilupime.rf.gd/divine_comedy_movie_trailer.pdfIn PDF document text
    • http://keruxenuriwi.epizy.com/tangled_up_walkthrough.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/52733611229.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/how_much_do_interns_get_paid_in_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ce17a4-a0e4-4e53-b438-c7ec316f0c63/97731311339.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_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 5388 bytes
SHA-256: cfd3fc3d875baf18ce105f8ce71498b4c461c0debc36ae2dcd052b4e1b818a7a
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 11140 bytes
SHA-256: 03b9017877a7110fb275b1dc3dfef3710bc611b5e2d3b34576aad56b104e1a98

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