Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7da91958c83d317…

MALICIOUS

PDF

126.7 KB Created: 2021-04-06 00:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a431b0dd1afcb0db382c2796c9576c4 SHA-1: c3f1d069206867235fd6ddb71875b2797dd629bc SHA-256: f7da91958c83d3175f288cd4b3882d09cb3a1ad1246c630fd1d142871e2746e0
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various Weebly subdomains. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs are likely used to distribute further malware or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://bologen.ru/award?keyword=analysis+sentence+starters+pdf
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/vuwifobox_minawejubalof_xumiramovo_sonagu.pdf
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/5ccae3483d65ea.pdf
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/ba56f.pdf
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/gibewapifalono.pdf
    • https://kutakikojog.weebly.com/uploads/1/3/4/6/134688668/mokemujen_gisizinuror_masoteromuvanow_tinales.pdf
    • https://xunijududivajol.weebly.com/uploads/1/3/0/9/130969830/rusolizitonatelapad.pdf
    • https://jowopuvuramikir.weebly.com/uploads/1/3/5/3/135313070/1faea26ff1d63.pdf
    • https://bisetegu.weebly.com/uploads/1/3/4/5/134528498/jifigoxeluzazupifavi.pdf
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/f815c4ca5a6c7f.pdf
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/7352318.pdf
    • https://popakute.weebly.com/uploads/1/3/4/8/134863009/bufinudasipem.pdf
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/wujanevoxexagu_mipuvolusod_ligetam_munivowove.pdf
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/20a3cb.pdf
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/puwegofewukelul-josukotesed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/netinuwa/terjemah_lirik_lagu_seven_years_old.pdf
    • https://uploads.strikinglycdn.com/files/1443accd-138d-422a-bf8c-efb20cbc9f6f/does_lock_pick_gun_work.pdf
    • https://s3.amazonaws.com/dupula/lomedinu.pdf
    • https://s3.amazonaws.com/bejenosugede/fate_grand_order_heracles_guide.pdf
    • https://s3.amazonaws.com/kubafezin/how_to_unlock_lock_screen.pdf
    • https://s3.amazonaws.com/rurovikejigibu/how_do_you_make_homemade_pizza_crust_crispy.pdf
    • https://s3.amazonaws.com/faluzotixupi/how_to_type_while_making_a_tiktok.pdf
    • https://s3.amazonaws.com/juliziwojatige/www_wapking_com_video_song.pdf
    • https://uploads.strikinglycdn.com/files/3f7d9584-6099-4fd7-8cf1-582ab5a6439a/35274310565.pdf
    • https://uploads.strikinglycdn.com/files/8fbc5f34-cfe8-4758-9370-0c60a1f0542b/sunbeam_mixmaster_replacement_parts.pdf
    • https://s3.amazonaws.com/bulolimepol/30112785960.pdf
    • https://s3.amazonaws.com/fedure/65742491959.pdf
    • https://s3.amazonaws.com/fizup/86535220454.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ca2.bin
06959af431462eb2907e9ccc3b05610116a95d75b2fdd47bce0e0a49accda840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CA2 5240 bytes
font_01_sfnt_off0001ae94.bin
c991a71d53ff83ff772461b16e464d507ec6c87544777cbff101154b19775daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE94 11860 bytes
font_02_sfnt_off0001d72d.bin
0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D72D 16164 bytes

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