Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee64e3629d6ae960…

MALICIOUS

PDF

79.6 KB Created: 2021-05-13 00:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 230ce15b12d95db94c1fe3ab0266159c SHA-1: caa2c55309a66c3ad34bbbf5c370e3eb1be364bc SHA-256: ee64e3629d6ae960ee78cab1324d2db58753eeb3cbcdf1f878503637b2bb67dd
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to financial topics, aiming to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=how+to+calculate+cash+flow+from+income+statement PDF link annotation
    • https://cdn.sqhk.co/koxuvusu/xijgKge/linear_pairs_and_vertical_angles_instruction.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/DjjBkje/how_to_change_my_server_location_windows_10.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzizadupu/Wphb3gc/12769380464.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/jh95jfF/81049398916.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/LSlifjg/games_like_kick_the_buddy_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_c7d16cbc85a44926820041be49fe50f9.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_3a878d04861c4379a5f2664d37b3f970.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_959a35e0a8604c4586742bba03f1ad7a.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_7fd36a1364fc464ba06ec40c56eff1f0.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_a716ddf1127e4bdd8613a4dcc9f6e116.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/70882499466.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/giwigiluban.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_09229211177c4ca5939126721ddca79c.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_21788642abb44959bb4885ca5c7b72a2.pdf?index=trueIn PDF document text
    • http://tirisesu.onlinewebshop.net/rewenonimawodi.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/bearing_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/guvizesuxepatu.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_329b5ded23464659966fa4f366b9f3dd.pdf?index=trueIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_2dcf262e21c9488287ef4d6cf902cfd6.pdf?index=trueIn PDF document text
    • https://5e7fdb44-65a6-4d88-9b36-b69c04d36e08.filesusr.com/ugd/b547b4_b8a13350df334015b0c21e1106727520.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/what_does_the_little_yellow_heart_mean_on_snapchat.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_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 5172 bytes
SHA-256: 9d99c4814e44aad8ae9e958032d0b62445b43761816d79d4be3ebe023a57f774
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 10828 bytes
SHA-256: 7d2b40c8dc39497b4a03971142e436d2c73cd79d3349de22ba7d91ad11770190