Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49be0f9b2ef67de…

MALICIOUS

PDF

69.7 KB Created: 2021-01-31 14:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2d8e65d95b3c2388a9d332d9124bbe9 SHA-1: 312e2b5e7d925beb9286519c147a5bc01abec3a4 SHA-256: e49be0f9b2ef67de7587e9162b1227bdfeb1e6ec8fc575ba288596035eb18fb1
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics indicating it acts as a redirector to malicious infrastructure and a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely leveraging JavaScript for execution.

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
  • 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 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.
  • 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/aws?utm_term=estimating+square+root+worksheet+8th+grade In PDF document text
    • http://xplaintome.ru/canela_de_velho_bulaz3u1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_5fd8510479ff3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fe4212a4f99d.pdfIn PDF document text
    • http://gazzsheff.xyz/rodemitotubifobirulozoheyku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_5fe9e012201fa.pdfIn PDF document text
    • http://helplnstagramoffice.com/49268312228whjzf.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/temuvunemewi_labexumosow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fcba4b814be1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/31588976990.pdfIn PDF document text
    • http://jesebikalag.epizy.com/molazujobuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/korecall_standalone_phone_recorder_with_answering_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/degezijopav.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/zurus.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/car_games_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/blizzard_hearthstone_android.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_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 5640 bytes
SHA-256: fa265b1c2013d658691b117ae7020d978df8c30d792dcb46ee46f57079fe61d9
font_01_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 11032 bytes
SHA-256: a2f7ebc3bee5de4eacfea4ab3c7634f276dee022eaa4b065cfbeff041d10c3c8

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