Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d079f2bd5c8edc…

MALICIOUS

PDF

74.8 KB Created: 2021-04-06 23:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96c61ce3670ad620a1fdce1f273c505 SHA-1: d537fc5418bd7a611a06f06a4ccfde703f2dbe88 SHA-256: 37d079f2bd5c8edc1b6fab2438bfb66d3b0b46460a4cd2eb74657b3d26a0669b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the presence of numerous URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=dc+snowboard+size+guide
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/1014669.pdf
    • http://duxinivodozular.mywebcommunity.org/57427212803.pdf
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdf
    • https://cdn.sqhk.co/jeforije/cWjg9VQ/alita_battle_angel_anime_film.pdf
    • https://cdn.sqhk.co/kavatupopum/jagghji/25505851159.pdf
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/zesoka.pdf
    • http://gifinibufenatar.medianewsonline.com/etina_pro_cizince_uebnice.pdf
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/7797803.pdf
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/9244397.pdf
    • http://dobafeser.66ghz.com/english_marathi_barakhadi.pdf
    • http://sevotapapi.22web.org/adfly_skipper_android.pdf
    • http://mizejodaf.mywebcommunity.org/auld_lang_syne_violin.pdf
    • https://cdn.sqhk.co/kejofuvata/8pgi995/sonic_adventure_2_chao_raising_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_def70411912e40ccbebb48e5996b9732.pdf?index=true
    • http://josisuvo.epizy.com/android_listview_adapter_listener.pdf
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_badd9c527d6b443dbeb522a0f3929499.pdf?index=true
    • https://s3.amazonaws.com/galinikagopit/punjabi_movie_ardaas_karaan_2.pdf
    • http://jogulele.epizy.com/alexander_pope_poems.pdf
    • https://s3.amazonaws.com/bubeto/yakuza_apocalypse_dual_audio_movie.pdf
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_e1cb426bcd8e4b348dcab4494e5eb4b5.pdf?index=true
    • https://s3.amazonaws.com/dumupa/what_does_f21_mean_on_a_maytag_4000_series_washer.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_off0000e4ab.bin
bb31aaaac1c563e8032a1f90dd33b1694060d9b1af650bd9e459bc6239d5dca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5356 bytes
font_01_sfnt_off0000f70d.bin
56541475c8bc449c087ee1ba5c6f641d68325d5eb50c761dab0fbbe4fe801f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 11292 bytes

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