Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90483412883321f…

MALICIOUS

PDF

74.3 KB Created: 2021-03-18 18:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d13dc244172a94e255381aa13874b72 SHA-1: 12d32b27b8dd62dbf608eea7e90977ff8d8761ab SHA-256: a90483412883321f861788bd2f9ba1f098a43c629a712b50e86ed6bd87d90a40
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The file contains a large number of embedded external links, with the primary malicious URL being https://pelibifir.ru/strik. This suggests the document is designed to redirect users to potentially malicious sites, possibly for phishing or to host further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=how+to+calculate+mass+with+density+and+length
    • http://mebel-albero.ru/4897109631061dg7.pdf
    • https://jaxazinozusepir.weebly.com/uploads/1/3/4/2/134235406/nomowolani_losurivibusofi_beruviretubofan.pdf
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/wazazidut.pdf
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/wirikolaf.pdf
    • https://cdn.sqhk.co/vizinifum/ih0hejj/soccer_revolution_2021_program.pdf
    • https://cdn.sqhk.co/zeritogekuja/Vgijgib/wigomemaxexulav.pdf
    • http://vash-fasad.live/valor_vendor_ashrangebw10u.pdf
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/betaxekipub.pdf
    • http://wirelessinfo.ru/954092101167fstw.pdf
    • http://salleop.xyz/oh_butterfly_tamil_video_song_freeik2p0.pdf
    • http://strgb2.ru/excalibur_car_alarm_remotekio15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fifomi/japan_travel_guide_blogger.pdf
    • https://s3.amazonaws.com/bolovopizonuki/basenetidesidilinowa.pdf
    • https://uploads.strikinglycdn.com/files/7008ed42-4cd0-4801-9787-6670eb78267a/how_to_volunteer_at_a_hospital_near_me.pdf
    • https://uploads.strikinglycdn.com/files/8e1ac74c-5b56-435e-91e3-1703044b9015/vemopekugiw.pdf
    • https://uploads.strikinglycdn.com/files/4cdfea8e-d001-460f-8e98-d3da1ebeebbb/pogabekamokisejakef.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/organizational_culture_4_types.pdf
    • https://uploads.strikinglycdn.com/files/5d2be509-4bb8-4d5f-9f0b-2ac89dd9c668/temomoruzutusanob.pdf
    • https://uploads.strikinglycdn.com/files/8a06df8d-d675-41f3-b678-dc6ebd5fbef8/past_simple_vs_past_continuous_exercises_multiple_choice.pdf
    • https://uploads.strikinglycdn.com/files/5bd3048b-3850-4636-9f8e-025b25a2d175/72837233341.pdf
    • https://uploads.strikinglycdn.com/files/e6989336-4484-4603-b00c-1488d7b44f7a/sound_blaster_z_se_review.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34f.bin
d275e4060f272c7e1c8047a5c7a18d7bb6b2fe2706da2fddfd1af08d72df753a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 5412 bytes
font_01_sfnt_off0000f5ab.bin
c460d2b079a6c09a470e770a4dda206c96013b0018b7c2eb47899230b9ee9416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 11212 bytes

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