Malicious PDF — malware analysis report

Static analysis result for SHA-256 2329ef4805f46def…

MALICIOUS

PDF

85.0 KB Created: 2021-03-29 13:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1f2425a4245ce2b656257bea8e2c3f92 SHA-1: bae5c59209c7b3ee649bb7e17c5ad35e571cbb7d SHA-256: 2329ef4805f46def9b711d26886e7fc1b72f5b16bbe798b0aed9ee60a6487466
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the presence of numerous URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=algebra+1+chapter+4+test+answers PDF link annotation
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/0c045fe706.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/1f626fdf77.pdfIn PDF document text
    • https://wavajonenavu.weebly.com/uploads/1/3/1/8/131871509/9688811.pdfIn PDF document text
    • http://xumegexujarev.22web.org/74178936498.pdfIn PDF document text
    • http://nabuvegawemuk.22web.org/24694364807.pdfIn PDF document text
    • http://wuzotevoxed.22web.org/68502502915.pdfIn PDF document text
    • http://tufataf.22web.org/how_to_say_ice_and_lemon_in_spanish.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/sugabarebazevalud.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/fodomabipudavuti.pdfIn PDF document text
    • http://rapaliku.iblogger.org/storyboard_free_download.pdfIn PDF document text
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/ca7ec3acc07a4.pdfIn PDF document text
    • https://juvinegedixipa.weebly.com/uploads/1/3/1/6/131637649/durat-bogorolasef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://forolulazo.rf.gd/solefezojixemazizufiwuze.pdfIn PDF document text
    • http://kedojaji.epizy.com/79617839911.pdfIn PDF document text
    • http://pepebejawu.epizy.com/wedding_invitation_video_template_without_text.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_65383b5007e544ada08ccb579f8efd9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/reredamusuta.pdfIn PDF document text
    • http://jalugegaru.epizy.com/baby_around_the_world_game_answers.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_dd8a084873cf4977acfd8f5924b7e7e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/burosobuluxaruv.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_a4ae052d971f412d9899b6ab80010eae.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 3936 bytes
SHA-256: d1745eb0fa302b75a5d55876260ebf03b990989de9606616c5493600831afc51
font_01_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 5188 bytes
SHA-256: 51b9e5c59c67f6b29176692368b4cd097f082e4778fb73fdb7e144d3ede15077
font_02_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 11668 bytes
SHA-256: 8e35540c5cf17e81b190e77d53cb53872c50faedb3fe2d4820643613f6643707
font_03_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34