Malicious PDF — malware analysis report

Static analysis result for SHA-256 690c3878c9d4cc98…

MALICIOUS

PDF

65.4 KB Created: 2021-03-28 10:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60f29627c3230a1124c07056b09e443c SHA-1: bd6d8201157f5c7e34db98482814e99fa801e811 SHA-256: 690c3878c9d4cc983dfd55529ba9be204bd8f95281e1994f51b95ace5aa6ceee
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to mimic search result content related to 'airline reservation system use case diagram pdf'. The presence of PDF_SEO_LINK_FARM heuristic firing strongly suggests a malicious intent to redirect users through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 4

  • 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.
  • 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://lozipotod.ru/award?keyword=airline+reservation+system+use+case+diagram+pdf
    • http://optalpha.com/270268565572ebv8.pdf
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/javukazuna-wajitaji.pdf
    • https://kogozodibivuf.weebly.com/uploads/1/3/6/0/136094397/5223297.pdf
    • https://cdn-cms.f-static.net/uploads/4416938/normal_605ee8bdb26ad.pdf
    • http://lestyprin.online/telokuam8uz.pdf
    • https://cdn-cms.f-static.net/uploads/4484633/normal_6017c69d5547d.pdf
    • http://redarirot.iblogger.org/amputation_definition.pdf
    • http://monongzhlh.space/42022735794axzsr.pdf
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5ffab705c3d06.pdf
    • http://sait-ok.ru/will_a_universal_remote_work_on_a_sanyo_tvisull.pdf
    • http://sewonmedix.ru/13658267369pm8td.pdf
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/luvolo.pdf
    • https://fijuvosezo.weebly.com/uploads/1/3/4/0/134096395/radaxozasi.pdf
    • https://cdn-cms.f-static.net/uploads/4447280/normal_60589e313e558.pdf
    • https://cdn-cms.f-static.net/uploads/4387052/normal_603eb6badbd30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_da391e40ad56469399ffdfec5e7657ba.pdf?index=true
    • https://s3.amazonaws.com/zemunomipazikez/97661649746.pdf
    • https://s3.amazonaws.com/jaloto/cutting_edge_intermediate_tests.pdf
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_7d405abca1ca4f6f8f402bb8c6c83b57.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_e785df9021b748658624738af71e21f0.pdf?index=true
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_8c926837a5e54feb813434a8ed21a6a3.pdf?index=true
    • https://s3.amazonaws.com/zodererezuzuxi/juretut.pdf
    • http://demajipo.rf.gd/20529308523.pdf
    • http://sokobob.epizy.com/36406528028.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_cff559df45af402ebd6c372f92d859ec.pdf?index=true
    • https://s3.amazonaws.com/jinabom/bobizopuwumewiwusul.pdf
    • http://ribaxexumipo.rf.gd/wugobafako.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c991.bin
b094a077c13adb66c2902db2675204becca775d46be12d82a1f11542e0ca96f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 5628 bytes
font_01_sfnt_off0000dcb3.bin
3fc27ad6572a18bf552cd9b4cd39d3b5c01c1861710dc5c4d2d20d2fe430d002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 9744 bytes

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