Malicious PDF — malware analysis report

Static analysis result for SHA-256 4587d134643e3d16…

MALICIOUS

PDF

74.6 KB Created: 2021-03-07 04:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7251978eaf038c099487a698d190053 SHA-1: 3042e9c202c50c1294feca718c59d27efd3bf1c2 SHA-256: 4587d134643e3d1637fec7629ab96c50845b0ca62aa0f3b93c54b6dd0e28392e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. The primary external URL observed is 'https://lozipotod.ru/aws?utm_term=culture+and+imperialism+edward+said+summary'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document. No scripts were extracted, but the structure suggests a malicious document delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/aws?utm_term=culture+and+imperialism+edward+said+summary
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/xaxiwowotoberen_sidemeg_ravopobarejike.pdf
    • http://loneresel.mygamesonline.org/cub_scout_lion_handbook_2018.pdf
    • https://rajidekexosixi.weebly.com/uploads/1/3/0/7/130738830/gavupekasaxu.pdf
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/wovirupogoxomido.pdf
    • http://bejisosubonito.sportsontheweb.net/why_does_danny_say_redrum.pdf
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/lexelozakapopa.pdf
    • http://ruwemipuwev.mypressonline.com/fexawovuxalawosav.pdf
    • https://cdn.sqhk.co/dagozuwemep/rdggiip/xbox_gaming_chair_canada.pdf
    • https://cdn.sqhk.co/tiwoxebu/PkTkgge/pedukebux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gixawetopoli/assalamualaikum_pic_free.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/41769651970.pdf
    • https://s3.amazonaws.com/vofadoloves/chock-_full_synonym_formal.pdf
    • http://pesetunal.onlinewebshop.net/pride_and_prejudice_movie_online_download.pdf
    • https://s3.amazonaws.com/pazatuv/bespeak_form_definition.pdf
    • https://s3.amazonaws.com/fewifuwu/33988668219.pdf
    • https://s3.amazonaws.com/juzowilipi/88994496857.pdf
    • https://s3.amazonaws.com/kezemiradigu/sample_purchase_agreement_template_word.pdf
    • https://s3.amazonaws.com/kelageketisefuv/11951456995.pdf
    • https://s3.amazonaws.com/vukujidor/basirhat_college_online_form_fillup_2019.pdf
    • https://s3.amazonaws.com/zoxewudunigus/jejogikewinogazumuduf.pdf
    • https://s3.amazonaws.com/bipovoromoj/bimatoprost_eye_drops_patient_information_leaflet.pdf
    • https://s3.amazonaws.com/bomifabipi/73302309803.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_off0000e6b1.bin
1dc38e2d9276a2e37f4cd6312fbabe118854a91d290b3fec616ceb5a01a62702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 5204 bytes
font_01_sfnt_off0000f858.bin
36d9a0908e37f57972ce37a51a54b136ea1458317801ef50b2c6c3a6179b8cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10716 bytes

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