Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b5891d2709e37…

MALICIOUS

PDF

70.3 KB Created: 2021-03-01 20:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 939f922e47d15693e629cf53e7e8f21b SHA-1: 7f43486740dd6ec5a06a3f0d5356eef1c2ce79e5 SHA-256: f28b5891d2709e37605439e8bee83d4f6d0777613e8cc8773ca8f56b2c496d7a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain product-related text, likely a lure to disguise the malicious links. No scripts were extracted, but the presence of embedded links points to a phishing or malware distribution attempt.

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 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://yafferge.ru/strik?utm_term=diamond+archery+infinite+edge+pro+camo+compound-bow+package In PDF document text
    • http://amsidgi.xyz/48548137627qpvk6.pdfIn PDF document text
    • http://storeyou.store/lexepejikevuvenezabakirctjs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_60251eb3dab10.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/jumefoxinawufol.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/guvekepukuxasudi.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/227f77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465701/normal_5fc74975660c5.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/environmental_conservation_officer_study_guidehfge1.pdfIn PDF document text
    • http://abanca-electronica.com/childrens_map_of_the_world_printabledesmb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6023dc1b72262.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/96624142036.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/maps_minecraft_ps3.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/sijunerikaxafijito.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/nexifiranozufejokex.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/is_the_bosch_ascenta_a_good_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/xajugozogunumofenotisef.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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 5788 bytes
SHA-256: e5231773c7ceb38126089a0abc543dafc1758659ee0a74651c9679243af41f69
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10700 bytes
SHA-256: bcafdb044089b9a682b70c3c7b2f821419b40d4ad2f5b32aa7d7f5643eca4943

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