Malicious PDF — malware analysis report

Static analysis result for SHA-256 7784f37c16a7933c…

MALICIOUS

PDF

80.2 KB Created: 2021-04-14 00:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef569d29ae82465c475308b0ae448407 SHA-1: d3b973541880def5c3ba9f4bd74e0fcdee707e6c SHA-256: 7784f37c16a7933c6122fc1655742972d701ca896771de9d439d31a1171263a3
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. The document body appears to be obfuscated or corrupted, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=the+stranger+albert+camus+criticism
    • https://cdn-cms.f-static.net/uploads/4485446/normal_5fd6e395cf4a5.pdf
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/2648103.pdf
    • http://goshop32.site/gravity_runner_30lekd.pdf
    • https://fefokepixax.weebly.com/uploads/1/3/1/4/131452923/8282938.pdf
    • https://cdn.sqhk.co/jekunesoru/shiJaoY/manuza.pdf
    • http://clientbluebadge.com/mechanical_engineering_salary_out_of_college6nbci.pdf
    • https://cdn.sqhk.co/palugalanivo/jnwkcX2/sojuvapofaxakodisi.pdf
    • https://cdn.sqhk.co/banamasuvaj/ghPjeif/rebel_inc_premium_only_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff65a463dd40.pdf
    • http://shop50off.info/lagewijixonosibakujurefv0qh.pdf
    • https://figidurilope.weebly.com/uploads/1/3/1/4/131452961/8469505.pdf
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/pajemireri_tenogisuxir_ravodarusigamun.pdf
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fc79034659c2.pdf
    • https://cdn-cms.f-static.net/uploads/4488582/normal_6024855c5fe9d.pdf
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5ffa86d423800.pdf
    • https://cdn.sqhk.co/zoluxoni/kZGijhd/voxedusepatazojanixijujuz.pdf
    • https://cdn-cms.f-static.net/uploads/4476947/normal_604920dd47fb7.pdf
    • http://trycabinets.xyz/does_burger_king_sell_breakfast_all_day9idoa.pdf
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fcd0ca2c8964.pdf
    • https://lixevipilevorox.weebly.com/uploads/1/3/4/6/134634278/watetuvamikitakuwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a4caeac6-140d-41c7-ae43-a0e63c7ce50c/cortisone_shot_acne_at_home.pdf
    • https://uploads.strikinglycdn.com/files/d4ad3dd8-dc55-4b35-abfa-e4877bdcf521/is_daniel_tiger_on_netflix_or_hulu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf9.bin
283442c41a53c28bf4098801ddf9b9aaef7c3f75d079a3921ff883460edfd482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 5072 bytes
font_01_sfnt_off0000ff09.bin
77cbfb01ad46f169e1558fe4d1f044d682ec9ac19d8d953bb21f93783b58dade		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10852 bytes
font_02_sfnt_off000123d4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 4324 bytes

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