Malicious PDF — malware analysis report

Static analysis result for SHA-256 b795394b83189d9b…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 16:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6e96254a73f316669c4fa79bc125d07e SHA-1: d23995afbed5c91179c89f63c88520b6778fa010 SHA-256: b795394b83189d9be76ace38e8c418fbf4251140b5f3790a0fb7c87f3bf5c1e9
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'managing time in office'. The presence of numerous links on disposable hosting further indicates a phishing or scam attempt. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+manage+your+time+in+office In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_5fe9aae54495c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_6008102c4f8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_600c26ecc142e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5fe0aa98a4e39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5ff284b88fc91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_601ceb2edebfb.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/98203616089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5ff54862dc2ce.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/4965344461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_600c14df703ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fd22319dd405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipulosi.atwebpages.com/noxoretejixi.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/52187194376.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_a1959803878c4b3eb80a6e6f57f2b5e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7684b70-568c-4b7d-9fc1-acfa3a7e8400/vampire_diaries_season_1_episode_18_full_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b870e8-b0b3-4f22-adda-3568785dc6de/how_do_i_change_the_battery_in_my_g_shock_mudmaster.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/donuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232168d7-ba89-44c0-a06b-42c1ad43b315/fugiv.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/roxezi.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/briggs_and_stratton_500_series_158cc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5586a5-7a1f-4b1d-a796-b5dfd482ef28/how_to_pair_samsung_remote_to_element_tv.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_a2d5166746df4d018f1f4f16c7e6f944.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee407f5-dab1-4115-a73c-d301d8418979/does_doctors_make_house_calls.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/who_are_jacks_biological_parents_in_the_importance_of_being_earnest.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_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 5148 bytes
SHA-256: 99beda5fdf7eaadaf22179e828bb43d8d0d6a07a8be92e6e82797529e50445b3
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10468 bytes
SHA-256: 1b1417809990fbeee990749ed5672a6cd1d84056129bb73fe5b3671aa78294e8