Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2fa80878ca7829…

MALICIOUS

PDF

84.6 KB Created: 2021-03-15 20:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72f69773c818008b21e459fd86f0352a SHA-1: 798c370caca578131c2bd86dfc495ada687f9a11 SHA-256: 5e2fa80878ca78293408fe6a09db90bf282278780e839b12c8dc229181e41822
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'dafemum.ru'. The document body, though heavily obfuscated, suggests a lure related to 'system software pdf'. The presence of numerous PDF links and a high ML score further indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/award?keyword=categories+of+system+software+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_601936c900769.pdfIn PDF document text
    • http://greatholl.com/62236712194httpw.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/sutefugifogodaxob.pdfIn PDF document text
    • https://jevulifed.weebly.com/uploads/1/3/4/4/134457796/1765747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fdafc45bbccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5ffc0fdf8562e.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/pefufulibakumajivij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5ff1cfdd77e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fd9bbf421259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_601485c84150b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_602ed216c45d7.pdfIn PDF document text
    • http://egrn-order.online/are_whirlpool_washers_any_goodasgqz.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/zijivevip/great_ampong_adaka.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_91a8cd238ef440a280f1b04a15641ab9.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_93d1fa091cbe4d1d860a57e3549da490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/filidabut/47495730792.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/buxudakujifofaxekev.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/broken_my_heart_song.pdfIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_0361adc3730b44a59077e1ca076d63bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/41571739402.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_294e3f2df44243f7853c4c7976d8b3c9.pdf?index=trueIn 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_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 5428 bytes
SHA-256: 45abbe3b8523d71991672e3bcd5f46326025236ce860510c05306537c2ecd148
font_01_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 11672 bytes
SHA-256: 616fa885104309fe9f595a00be9acb3038180ae00ef6af8ef640e7e894263b66

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