Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd5fc82db1fdb39…

MALICIOUS

PDF

86.3 KB Created: 2021-05-05 22:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 45c9ba47a09d847c7bc3344b36b97106 SHA-1: 20a9e968ea14b8715e069d7852236f2a4cde8bf7 SHA-256: dcd5fc82db1fdb3906aa91a224a2e8ea6a8861c67911a2b2551779062bf715ba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=beginner+korean+exercises PDF link annotation
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/lujurebudemuxopom.pdfIn PDF document text
    • https://lemapola.weebly.com/uploads/1/3/1/4/131407815/kumobekisu_porax.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/baduwulugesaxip.pdfIn PDF document text
    • https://denibizokitig.weebly.com/uploads/1/3/4/3/134340328/1202712.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/chg0hic/my_movies_pro_3_pc.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/38b12.pdfIn PDF document text
    • https://famunekagazata.weebly.com/uploads/1/3/4/4/134463602/gobagebezu-waman-fijofugivubem.pdfIn PDF document text
    • https://cdn.sqhk.co/vipatajase/sgi4geO/word_stack_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jgnTgfm/4_pics_1_word_level_2235.pdfIn PDF document text
    • https://cdn.sqhk.co/feziwetesene/iwidnib/bulem.pdfIn PDF document text
    • https://ritidajadufe.weebly.com/uploads/1/3/4/6/134622671/gakukewuze.pdfIn PDF document text
    • https://wogilaxafa.weebly.com/uploads/1/3/4/4/134479860/7074940.pdfIn PDF document text
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/2660ea4c.pdfIn PDF document text
    • https://cdn.sqhk.co/xapanularopu/z1k3chd/30711082032.pdfIn PDF document text
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/fukodesew.pdfIn PDF document text
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/jutumowulukej_bixemosox.pdfIn PDF document text
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/5485796.pdfIn PDF document text
    • https://gilurabad.weebly.com/uploads/1/3/0/7/130775641/pugasik_rapegejige_mezerexa.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/ebd313b7-450f-4d1e-9d02-7a4856c055a9/nalc_pay_scale_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675b9e41-5b65-4883-a817-816ee45076f6/gnostic_gospels_mary_magdalene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e414269-16a4-4a2f-82f8-fc817f472f1c/msi_ms-7641_ver_3.0_motherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e981a35-cfc2-437e-bc57-5c08683187a3/pamadovidilasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ea896f-1d99-4cdc-a42b-94cd8e84309d/narcissus_and_goldmund_book.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 8660 bytes
SHA-256: ccf927f0605bfe2c7d209743f4d0e546bc839662751dab36f03ede462fcac637
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 4824 bytes
SHA-256: 718f397e261feb194d7b0a9f7fda1ce84b24c6ae844862f27a1de8d7eeb528f4
font_02_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 10572 bytes
SHA-256: 51ebf94a7aa572951b5383d64c37f58394f4cc87bf5720f246be3f6d766bb400
font_03_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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