Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0612d39c2ad292c…

MALICIOUS

PDF

86.6 KB Created: 2021-04-04 23:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c2d4e49ae23c4089e8ed044e9e376211 SHA-1: bd2c3a30d3eabf3870ea5a28bcb4f11fe7b34175 SHA-256: a0612d39c2ad292c8da218dcdc0da7c6b3a421f5c90971fd4a56dfb18fbf2aec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine rankings or distribute potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond being a link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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://baarspo.ru/123?utm_term=holy+rosary+guide+app PDF link annotation
    • https://nupinegudoxaxu.weebly.com/uploads/1/3/5/3/135350485/sujevij.pdfIn PDF document text
    • http://dejonuv.22web.org/taxexisiputebitata.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/hijoyid/rikolukimuso.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/83894403241.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/uidLtxU/rojanosiwidewiki.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/ejhyOjc/bawuwaka.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/jb0Zhbw/island_tribe_4_free_online_game.pdfIn PDF document text
    • https://foduvixet.weebly.com/uploads/1/3/4/4/134498725/gonozilot-pabarojogisi.pdfIn PDF document text
    • https://cdn.sqhk.co/bebuvasipen/jeielja/ontological_argument.pdfIn PDF document text
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/tebenubivimegipozo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75b9842-1934-4cd1-9afe-af3f2eab6764/36481787592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d484ef-46eb-4ec2-98ca-a9e142922e76/5_languages_of_love_summary.pdfIn PDF document text
    • http://gaxodusipif.epizy.com/infinitives_of_purpose_worksheets.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_526960b94ab549c985018ba53b803574.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ee6131-6633-4c6e-a4ed-22f3ad100f7a/hocus_pocus_cupcake_magic_kingdom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2093db-eb3d-4155-8cba-7e76a00eb89d/serious_daring_ebook.pdfIn PDF document text
    • https://96a604d4-6f4e-42dc-90fb-b802e1cf4ed0.filesusr.com/ugd/6ef60c_30db8be440b44eab9c706c9156e8dca4.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_71c5b1a3b3b24dc9a5fc02e9bc6df096.pdf?index=trueIn PDF document text
    • http://fogosapew.epizy.com/adanga_maru_full_movie_in_masstamilan.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_6d21de22ad96439bb9c74bbe30b09540.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f922be9e-3afd-469f-90d2-a49eb75432b8/nozawox.pdfIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_947c4d46a85a4e38a93435aca210c349.pdf?index=trueIn PDF document text
    • http://tifuximixadove.rf.gd/chemistry_valency_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0c3c9f-5a90-4cdb-9058-22463130176c/15958526941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10451af9-f658-462e-abf5-097a9dade875/38768740065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fdc5c0-9152-4176-aafe-c09e4268779a/how_much_is_a_new_lamborghini_gallardo.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_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 5192 bytes
SHA-256: e62b3b2c9c8b057ad2bdcd9ad3195225c3e8ee5c97d5832e396dc24bd18855ba
font_01_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 11332 bytes
SHA-256: 356072a28a05a5352d6b40927155e8bb1a463582c0cb7dba6334591df2864332

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