Malicious PDF — malware analysis report

Static analysis result for SHA-256 958e8b9bfacf3da4…

MALICIOUS

PDF

85.9 KB Created: 2021-03-30 04:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c58fa88867f29e11133e20e9919326a6 SHA-1: 4a6f3d78e7dd4ec0ee8e3fe8bdb45c8ad9967ff2 SHA-256: 958e8b9bfacf3da4a54535811bc4dfb62df16640e33057e2bfe3c0f191f6d83d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one specifically identified as a potential lure for a '2012 honda civic ex service manual'. The presence of many external links suggests a link farm or redirection mechanism, common in phishing or malware distribution schemes. No scripts were extracted, but the PDF structure and link farm heuristic point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=2012+honda+civic+ex+service+manual
    • http://nutapobo.iblogger.org/doom_build_guide_dota_2.pdf
    • http://juxoxelobonoje.22web.org/denebofiripuketejogemiw.pdf
    • https://cdn-cms.f-static.net/uploads/4498678/normal_606168f6e3309.pdf
    • https://cdn.sqhk.co/vopirewilofo/jh4U00c/kudigumidusufijijol.pdf
    • https://cdn.sqhk.co/gatuwaven/9iiIghm/trenches_ww1_today.pdf
    • https://cdn.sqhk.co/menodotitit/RNDTRjj/best_car_racing_games_download_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4491173/normal_605897395c5e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_fbfdc63e63614bcbbf72b7375c99d439.pdf?index=true
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_92f22eb2a08646b791731f0eafd023fe.pdf?index=true
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_6bfb8143016543c6a393643e37949fb2.pdf?index=true
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_c460894698144d7d91dc2bd70545a074.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_cfa5cfc613cb42c78132b8d4a04acdd2.pdf?index=true
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_7cffa38c7a2c40129e72c43d39ed6702.pdf?index=true
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_61ebd760aeeb41d1b51de6836c81beaa.pdf?index=true
    • http://todizugofufufax.epizy.com/samozuposolotemareni.pdf
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_b81fee6dad28429dabb0fbbb47f2b580.pdf?index=true
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_1731a7a720b64e8596a2e546704362e2.pdf?index=true
    • http://babokad.epizy.com/tiragukididuvuw.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_4fc04ecd302042e2ab6f9a79a4972a19.pdf?index=true
    • http://wafugid.epizy.com/fivunoxolirawepib.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_ee6070154c724baf99a975610563cea6.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_0b7df6bb057644ebbc5d0f87a2de3bf6.pdf?index=true
    • https://c11b0c24-b595-42b7-8504-076b721ac78c.filesusr.com/ugd/a9248e_18d14443295a4bbd828079c7c903a136.pdf?index=true
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_e3784f6f5a61489eba9f1b380d0de966.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f1b.bin
0c6c2312d8e9384884114022638f1d63da40e93d40c7fc7a45dc445c28a61224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 5540 bytes
font_01_sfnt_off000121cd.bin
e5b0495d951165bd78d56bfc7386baaf96ebe6ab7f4817e33e0d16f5850a18bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 11188 bytes

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