Malicious PDF — malware analysis report

Static analysis result for SHA-256 df843a2811ee10e8…

MALICIOUS

PDF

83.4 KB Created: 2021-02-17 05:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f86dc4f7d688dbc025caf66bf181b2ed SHA-1: 59bdc9d8d607fb720f24d0fea57b51d3d38e7b08 SHA-256: df843a2811ee10e879ae9d51d4e775f7445ef2b25aaa051a50686ef7e581c5ce
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a keyword search term, reinforcing the lure. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=best+macbook+pro+backpack PDF link annotation
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/170a2de.pdfIn PDF document text
    • https://nizodori.weebly.com/uploads/1/3/4/0/134000204/7976785.pdfIn PDF document text
    • http://starconflict-game.ru/agl_energy_company6kknl.pdfIn PDF document text
    • http://bilet-pdd.site/gebawumidamj6o6.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/3gdhfsf/20534315495.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/3cafd35e82181.pdfIn PDF document text
    • https://togijiwasifuva.weebly.com/uploads/1/3/1/3/131398416/2853686.pdfIn PDF document text
    • http://f1l3download.site/64402843178l40fr.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/musulela-xapinodoxat-zuxuzojajok.pdfIn PDF document text
    • http://zoneeuro.pro/what_does_pearl_mean_in_the_bibleooaln.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/sofokinub.pdfIn PDF document text
    • https://jibuzuku.weebly.com/uploads/1/3/0/7/130739289/fivilatupig.pdfIn PDF document text
    • http://afracheat5.xyz/alfie_evans_case_reportwr7cp.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
    • http://wimifus.rf.gd/lubakododujamabe.pdfIn PDF document text
    • http://zoxarulal.rf.gd/fezugirovudikuroxereniru.pdfIn PDF document text
    • http://pekudus.rf.gd/interactions_1_reading_gold_edition_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 4936 bytes
SHA-256: 7c8548a91d2bf4bea48e1aab1e0b763bad6a2dac854f8d94ba5be4c578c13d14
font_01_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 10380 bytes
SHA-256: c6aa05d427e4517bfd44b21670291aa042d65f4d423ca0544001ccf3f4fbe3da
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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