Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd08ba8cd2fe2621…

MALICIOUS

PDF

88.4 KB Created: 2021-02-09 17:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1ca8b6687dd38c4cdc8b5c104e7657cc SHA-1: 156fbf3375bd7e557994653e7c7ad40834b55632 SHA-256: cd08ba8cd2fe262113b0c348fcf32b4d0e08f99eb05c1cea6b449e9521d31a4c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or distribute malicious content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/aws?utm_term=summoner+druid+diablo+2+guide PDF link annotation
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/185fce892adcd.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/dOiiTWB/tow_truck_icon_png.pdfIn PDF document text
    • https://sudoxelavekif.weebly.com/uploads/1/3/5/3/135305243/c52f7778c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393204/normal_5ff50fa648a09.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/sanukenusutuxaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/XEgRbjg/vutelofojofifedidod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff6c2a45d53f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5ffb91e0f04af.pdfIn PDF document text
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/864805.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/JyujjaU/20277790092.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/pufiw.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/fgi278V/23580346008.pdfIn PDF document text
    • https://ratewanevunexem.weebly.com/uploads/1/3/2/6/132681210/1e13d0868027d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megelugik/58793214762.pdfIn PDF document text
    • http://satuzolo.epizy.com/chikni_chameli_full_video_song_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/south_film_video_hd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 5344 bytes
SHA-256: 9000e2f228043d5d6f200c1937505423d2cb2cdaead701773fed44a9de16561a
font_01_sfnt_off00013004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13004 10692 bytes
SHA-256: 5fa520c0e70ea1ad63c6307b3fbb09612f436291f64d759692959ad12203dc08

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