Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aff48c6ad10e98…

MALICIOUS

PDF

121.1 KB Created: 2021-05-19 23:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2b9328c859587fa0d0c3e396e6629b4b SHA-1: b4e37a0e4b750c17f1b53a53866d9d807c25e079 SHA-256: 16aff48c6ad10e98ebcacd5cecd8cf881a2c126ca2e72b06eb905c7c9d0b3aba
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://ponafet.ru/strik?utm_term=arithmetic+sequence+maze+worksheet+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420587/normal_60571254a2b13.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/vovifajisa_lumirawupazomu_fowejelepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454438/normal_5fffef68d4e67.pdfIn PDF document text
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/4583747.pdfIn PDF document text
    • https://xabodalemebom.weebly.com/uploads/1/3/1/3/131381489/1584d3d4e.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/4493145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e2d427-4008-4089-a2d0-3ee1aa20f9f1/timex_heart_rate_monitor_chest_strap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c464289b-6a22-4fbd-b162-2142996b1348/sex_offender_registry_sevier_county_utah.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/hp_deskjet_2132_wifi_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edff11c0-1532-417e-b74f-c329c094bbf2/lozanixidapaseneluj.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/class_12_physics_project_on_capacitors.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/1604684376.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/wuzopowapefodebiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/zoxavedunobene.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/inter_1st_year_english_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21cbfeb-a3a1-43a5-9d70-5d623ca1a25b/86823148390.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/how_to_administer_medications_through_peg_tube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6f6af8-3bac-46fb-8fdb-8ac77ea414b7/27026846181.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/42172689140.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/54103250837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4729f8-804f-45a9-a20d-32c538cc7802/lelesurafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f37934-7ab4-4739-a443-7a276a08bdf0/best_indoor_soccer_drills.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/61451585923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c1558d-253e-451c-b649-d917f70c5ef2/snap_on_solus_pro_scanner_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6217a18-13cd-4efe-8f65-4121a57fbd91/papejijulikoresix.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00018642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18642 6864 bytes
SHA-256: afdaf4a52d7dd71a7984f150eb21bdf8698dcfbc73e11c900856d88eea814117
font_01_sfnt_off0001978f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1978F 5328 bytes
SHA-256: 71462c7855c0ebe000ebfe12b70a7dc170823892d633c9b10c37c6407411a5dd
font_02_sfnt_off0001a9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A4 12916 bytes
SHA-256: 6362eacc57842d8ff0810509d98a554f2314a9a2c243e7be1580e1176fd35b7f

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