Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8af5dcb4436908f…

MALICIOUS

PDF

79.7 KB Created: 2021-03-04 23:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a6fd60ef59532481f2804b9bf016cd2a SHA-1: 88d8752b7bc9ca4c1bbba9b76211755483dc20ee SHA-256: d8af5dcb4436908f5faa83d80579603aee2143868cf2a571daceb038e3891c06
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'The new oxford picture dictionary english spanish pdf'. No scripts were extracted, but the presence of external links and the malware classification strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://golowaki.ru/123?utm_term=the+new+oxford+picture+dictionary+english+spanish+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474457/normal_602e26411170d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601fd4e4ebed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_603b9d566f83e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_6000cae57bb90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_602877d770912.pdfIn PDF document text
    • http://wamikesaximilub.22web.org/proofs_involving_congruent_triangles_answer_key_2010.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
    • https://uploads.strikinglycdn.com/files/01d20f60-a3e2-42a5-a94e-3179b425b663/dymo_letratag_refills_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03817f7-7449-4169-a4b3-aa26483991c5/96390258564.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/delonghi_dragon_space_heater_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/solenoide_mircea_cartarescu_gratis.pdfIn PDF document text
    • http://sivigowukom.epizy.com/footbridge_design.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/zewuwuwofupevedozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7971b8f-1c58-4fd1-8503-d210710a8fb8/74645817438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68216c1-1c29-4d83-a8b8-4443cb09c263/59672060603.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/best_icon_site.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c98be05-4372-44d8-89e6-5221984d83e8/49531530820.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/6054077202.pdfIn PDF document text
    • http://muvotezazalad.epizy.com/59599880545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd87b16-1db4-417f-a016-44ba445aeb85/96504226375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8a1e92-84d6-49c5-a350-61bcc1078c55/what_are_pituitary_gland_disorders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd82848d-210a-4b94-b637-cb5c71c1294c/hp_4500_print_cartridge_missing_or_not_detected.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 5512 bytes
SHA-256: dd1dc3560f719e33f9f766380b96e37db957d721246f85f72e21897ffd1bf3fb
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 11268 bytes
SHA-256: ae917e1b24dc9db18bc7adfab646c9e12cdbdb1a31aacb603c2f96aadc203538
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176