Malicious PDF — malware analysis report

Static analysis result for SHA-256 131392a7b2b294c1…

MALICIOUS

PDF

99.6 KB Created: 2021-03-24 20:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a258ffba0e85fa5d3fd0dc5cb20f5a98 SHA-1: 3cbaca2b2781d6f043e95fa1c2b754a470f2c7ac SHA-256: 131392a7b2b294c1f398d5caa2931cb9726040b1b3fd9f6dd6226ed639fbaba7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=how+to+get+symbols+on+dymo+letratag+xr PDF link annotation
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/1896725.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/dibjafO/difejor.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/yankee_doodle_sheet_music_violin.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/kimotusuzuv-litobepekuvaxeg.pdfIn PDF document text
    • https://finazevad.weebly.com/uploads/1/3/0/7/130739247/2590c83a.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/jihjgje/funny_animations_youtube.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/gutovixigu-wagafijiwo-bozejov-xazuro.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/3346447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonimamodiji.rf.gd/kodofivabijanububipedazob.pdfIn PDF document text
    • http://gexovudin.rf.gd/revista_eudora_ciclo_6.pdfIn PDF document text
    • http://rajakoxefulume.epizy.com/wayne_dalton_garage_door_opener_quantum_3212_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/clash_of_clans_offline_apk_no_root.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/lorimir.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/online_registration_form_of_sainik_school.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/vagetabexawonak.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/a_discovery_of_witches_season_1_episode_1_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/noughts_and_crosses_book.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/gudodezariw.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/60908955294.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/how_many_calories_in_a_taco_bell_double_crunchwrap.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001435a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 5508 bytes
SHA-256: dc6d5f219ff3d58322897411bfccb993b7c4b4bdfde04062b0208999424756c0
font_01_sfnt_off00015614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15614 13368 bytes
SHA-256: 3494795df585ebaa40c289831f16c55b9adb42e4a2de0cdbac0c829fc013bc73