Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6abe28288593d6…

MALICIOUS

PDF

78.4 KB Created: 2021-04-09 19:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 03531b08584e415f831d275fb9b4d911 SHA-1: ce172c00c7bec902865faaed8c9d82e3f9f05126 SHA-256: 1f6abe28288593d69d0c878d5729de6cd2c42ca18742b1c0eb4ad177824f6d97
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 0.9964

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/strik?utm_term=rumi+poem+love+wedding PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5fe42985ae000.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/xesoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/dibhb7b/vowiti.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/hhhdahg/96272119218.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/Qjee1Ko/cobb_10_theatres_in_winter_haven_fl.pdfIn PDF document text
    • https://roxodebovak.weebly.com/uploads/1/3/1/4/131454305/ed88c31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_60595784e794f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_6065841257663.pdfIn PDF document text
    • https://wufodosutitivo.weebly.com/uploads/1/3/0/7/130739718/6127476.pdfIn PDF document text
    • https://gedobelega.weebly.com/uploads/1/3/4/3/134375191/boroligozatexemuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_604f47eb3f9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_60559d94b3695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_6026e8eb36a68.pdfIn PDF document text
    • https://cdn.sqhk.co/zawitagevute/gfggeU5/pogumosonagomeforajojek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406501/normal_5ff3a02d65944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_605d70164bafc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5fe24ec2aefcf.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/R0TtuF2/248184639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_423dffa09fe942a09cb4367018405677.pdf?index=trueIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_9b56df41c92340518800ab74e77a0697.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e7d89a-5564-4a2b-a8d2-3b864b403e3c/stranger_things_sheet_music_cello.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1535ef6-a1bb-4c73-ba34-9ef86442c7f2/5801712826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64d1369-1e30-467d-aeca-e792e4fc8e3a/ionic_compound_practice_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a9321b-34d9-4960-a51e-c3c41e2346db/walavulikewetoketi.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_2fb08ffa160c4d219891ed1b7924d9a1.pdf?index=trueIn PDF document text
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_05dc64128f3b4922a66eaf96c0f42ae1.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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 4952 bytes
SHA-256: 673f9bbe2332be9f87151ef61ee350b1a7a52d98c9c0c2b5bcbc99f28f7f4457
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10788 bytes
SHA-256: 9f940d536e7f8aa77d57d57fa55e8a57b6656246fb7c2a4b309127bd22a3e1ed