Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06fea4b08ce7ef8…

MALICIOUS

PDF

77.0 KB Created: 2021-03-13 17:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada56aafbe0507c196511acba3d5ac4b SHA-1: 72db4501158a26fbdddd501af71a34066f1cea36 SHA-256: c06fea4b08ce7ef8397804ea60cbd8807012e1e973016f861d0653f2e2407b5f
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a large number of external links, many of which are likely part of a link farm. One of the extracted URLs, 'https://maypoin.ru/wix?keyword=eliminator+weed+and+grass+killer+instructions', appears to be a lure, while others like 'https://s3.amazonaws.com/woxewiwupir/benisa.pdf' are part of the link farm. The document body is heavily obfuscated, but the presence of external links and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=eliminator+weed+and+grass+killer+instructions
    • http://youralteragoods.com/art_of_conquest_dark_horizon_mod_apkhkj27.pdf
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/finolejekave.pdf
    • http://pagebake.com/368764240239a1k5.pdf
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/55a103a2f0a.pdf
    • http://rimiripa.mypressonline.com/can_you_use_turtle_beach_xbox_headset_on_pc.pdf
    • http://gefosezidubajoz.scienceontheweb.net/61929772761.pdf
    • http://gelchlen.fun/briggs_and_stratton_pressure_washer_carb_diagramci8hq.pdf
    • https://pifupiwotuz.weebly.com/uploads/1/3/1/3/131384694/pixonajowazazusonuju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woxewiwupir/benisa.pdf
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_96e9b24168164e3b923df93227d05bb7.pdf?index=true
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_75ff8d5cca474f688b9957b014bce72e.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_9397ecb3571c47179b1b00abee1206ba.pdf?index=true
    • https://s3.amazonaws.com/mamukawaxatali/como_converter_arquivo_autocad_em.pdf
    • https://s3.amazonaws.com/perurulexi/81184070313.pdf
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_131f6a05b72445408e34dff6013afef4.pdf?index=true
    • http://livirava.atwebpages.com/el_arte_de_la_guerra_sun_tzu_resumen_animado.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_45983e5c5dd04304ba2c383a8e0e7b03.pdf?index=true
    • https://s3.amazonaws.com/luworizesupox/62588393981.pdf
    • http://bopewexe.onlinewebshop.net/budaya_betawi.pdf
    • https://s3.amazonaws.com/litunux/26_11_mumbai_attack_full_movie_moviescounter.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_off0000efe5.bin
a377b0417fb7b2c58fb63301cecc09ecfae769fd385c9178bad7a051cd20dee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 5372 bytes
font_01_sfnt_off0001022a.bin
07ef60e07ccc29d97a21d23fefe37e20d59c517778fb23ff178db78eb56ee186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 10656 bytes

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