Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a579c685e807b8…

MALICIOUS

PDF

75.6 KB Created: 2021-04-07 04:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ae5971558b26ac83a1d642e5fc0cb642 SHA-1: cf7d5bcb172474264f8c53398c4aaaac338f467e SHA-256: f7a579c685e807b8deb9609ac0c8568897ac05a39e14542c61949835983d2c08
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=alone+piano+sheet+music+pdf PDF link annotation
    • http://telovajov.medianewsonline.com/nordictrack_x11i_dimensions.pdfIn PDF document text
    • http://summerita.fun/are_ge_adora_appliances_goodng9g6.pdfIn PDF document text
    • http://gonzo-3d.com/byomkesh_bakshi_stories_bengalifhxtg.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/der_bahnwrter_thiel.pdfIn PDF document text
    • http://tatabumilik.iblogger.org/science_geek_atomic_structure_quiz_answers.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/wofenevuxofeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_36bfc213edf247739cee3b0e7b1f4c27.pdf?index=trueIn PDF document text
    • http://sinivexoxal.epizy.com/22732684077.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/activator_methods_protocol.pdfIn PDF document text
    • http://zuvaxazalafes.epizy.com/jaluzube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bdade0-166a-4fed-a8c3-029aaef2da5d/64055499047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980e0c98-786a-44f4-88b2-989bddd5b539/how_to_do_scientific_notation_on_ti_34_multiview.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_f99b071812844638b2d3e2db36d048c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5aa09f8-65bf-4dbd-8b39-ebe00ba6b968/what_are_the_best_deep_freezers.pdfIn PDF document text
    • http://xafinosule.epizy.com/41923689020.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_ec2aabbe5516485d956be3477171456e.pdf?index=trueIn PDF document text
    • http://mimuzef.rf.gd/gazebo_tutorial.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_08df70e08b6548dfb8ee2edfd5b4e217.pdf?index=trueIn PDF document text
    • http://talebegizudukez.rf.gd/90178620617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67083fa3-8b66-4abe-b786-2a1895895205/13275441844.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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 5288 bytes
SHA-256: df1af407d01184f2ab2c465b7ac33dbcbd84316dcc4c80fd15a65936fa63c08c
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 11240 bytes
SHA-256: 37d62eada7a56a714b167681fe4ecf73d32e54e5f829bbe1b770c17837987454

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