Malicious PDF — malware analysis report

Static analysis result for SHA-256 566e49f65be0d650…

MALICIOUS

PDF

90.6 KB Created: 2021-05-13 02:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b99daa4f675a61e139f8171774e804b6 SHA-1: cccf021289b23239c6cb4f319dd3452a4b2904a7 SHA-256: 566e49f65be0d65059b316351548bfe2ccf685d1671deea5fe89087afdaeae5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs suggests an attempt to manipulate search engine results or distribute additional malicious content. No scripts were extracted, and the document body was heavily obfuscated.

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.
  • 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://jacksth.ru/strik?utm_term=the+land+of+stories+worlds+collide+review
    • http://fobexugelego.getenjoyment.net/tatafekixudoxawajamo.pdf
    • https://static.s123-cdn-static.com/uploads/4410962/normal_5fc922bb6dcf3.pdf
    • https://zijobezugol.weebly.com/uploads/1/3/2/6/132682913/xupomeripenivo.pdf
    • http://wefilevazobakeb.mypressonline.com/3524025424.pdf
    • http://wulutapebime.getenjoyment.net/braveheart_partition_piano.pdf
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/01c246eb482a6ce.pdf
    • https://xamorefozinibir.weebly.com/uploads/1/3/4/6/134643183/83111a2d7dd71d0.pdf
    • http://wifunagidoli.mypressonline.com/hbo_max_not_working_on_apple_tv.pdf
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/regiroxeg_dologu.pdf
    • https://cdn-cms.f-static.net/uploads/4380545/normal_60387685f0b0b.pdf
    • https://cdn-cms.f-static.net/uploads/4492286/normal_5fe989be1e060.pdf
    • https://cdn-cms.f-static.net/uploads/4376088/normal_602b99f025b46.pdf
    • http://tejowigasinafu.getenjoyment.net/respiratory_or_metabolic_acidosis_and_alkalosis.pdf
    • https://mopopapepiror.weebly.com/uploads/1/3/2/7/132741339/938c9c1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_e4be53689a5b44abaa7a1c1a1a9f1082.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_0cbb016c5aa2460ab468f38e7d8dca75.pdf?index=true
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_227a6aa139e246169551837b37f318c3.pdf?index=true
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_df339722ac0a45708f157de17cb8799e.pdf?index=true
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_7fee7b70616d4c4aaa4fdc95dc586666.pdf?index=true
    • http://rivetibixonapaz.myartsonline.com/31149750756.pdf
    • https://uploads.strikinglycdn.com/files/f666fac8-68e8-4d7f-aada-0664716d867f/howl_poem_quotes.pdf
    • https://uploads.strikinglycdn.com/files/989be064-45c8-4bb9-bd98-bcbc399b5a6c/what_does_the_long_game_mean.pdf
    • https://uploads.strikinglycdn.com/files/5d959c0d-76af-4246-be32-bccff9580c75/vipamokusezeba.pdf
    • http://jokosen.atwebpages.com/space_odyssey_series.pdf
    • 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_off000121d2.bin
f256a64926bb7329d617f24368e7d2157af2e80b21078cc58114c0df1431e408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 5212 bytes
font_01_sfnt_off000133a0.bin
fa3a40c6a3236e56fcc56ad2df377636c4abc138fdac8c117db1513c2153a04b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 11668 bytes

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