Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5e95cf06b75d13…

MALICIOUS

PDF

89.1 KB Created: 2021-05-25 07:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: baecd5c9addcc7ad54578dd02d51bc4d SHA-1: 2563ef8f61a91ff819389d02592d1cf64e1dcfac SHA-256: 5a5e95cf06b75d13cc87948b9af71ad32e7a125409561f54e96c114fc957a96a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though partially garbled, suggests an attempt to appear as an academic resource, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=exercice+de+figures+de+style+1+bac+la+boite+a+merveille PDF link annotation
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/a32d3b34.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/504c1cf5b40f.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/6603412.pdfIn PDF document text
    • https://lureriwoxefewu.weebly.com/uploads/1/3/4/5/134590368/dujuzipa.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/tobul.pdfIn PDF document text
    • https://tumavogadagakep.weebly.com/uploads/1/3/4/7/134721967/5176588.pdfIn PDF document text
    • https://ruzudewalaxuge.weebly.com/uploads/1/3/4/4/134497745/a4b200ae99a.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/0d0bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b1ef1f8e-65f3-46cb-806a-16b160bdc007/54795386500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f18f917-2ac8-4f95-8c11-c5a8e3623494/premier_protein_shakes_coffee_flavors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb6c378-0740-4719-b1a8-7569824b8c2a/mugado.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/besofanokekusaralivomadux.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/how_to_end_a_scholarship_essay_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/adolescent_psychology_noun.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/dijaxoduxogeludava.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/flow_diagram_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/whatsapp_for_nokia_e72_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/10967369438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2df5ef-a852-4a17-bf3b-28734fbcd4b0/how_long_to_notify_dmv_of_address_change.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/osrs_imbued_slayer_helm_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f7cf48-d794-4baf-a156-2d0415e73c5b/tekonsha_voyager_brake_controller_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/assistant_commandant_upsc_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcbc9d5-d1a2-4c9b-86a6-2da90459d99e/tasapixunam.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012cf9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CF9 17320 bytes
SHA-256: 0ead07d65aa5805573aaddeffeb9161a32970b9fd0e5bb5389ff1ddc112752a5
font_00_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 5496 bytes
SHA-256: 05a6cec23f8c13cdcc2c88ad9791cb5dc25d963b2ea8e4744fadd88c0489452f
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 12136 bytes
SHA-256: 1408c8d9d9e4b806b72a14772d5c057db9d4b09d321590dc315377ff39aae7bc
font_03_sfnt_off00014645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14645 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333