Malicious PDF — malware analysis report

Static analysis result for SHA-256 208614c1de5e737c…

MALICIOUS

PDF

106.3 KB Created: 2021-03-10 11:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b4deccd28c1dcae4d797066c4d0109c3 SHA-1: 19729b598fdb7251ed46339a04517b3ce75beabe SHA-256: 208614c1de5e737cf198db72ad00dba708f9255abc9e6fcb74e9e80a9611d0f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=5+points+of+darwin%2527s+natural+selection+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/zixemoliz/cxBDchd/sokitutezoluluguwa.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/ieijcjf/survival_gear_list_for_hunting.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/hG7idjw/kidcity_hello_neighbor_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/1jbhghc/86806687210.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/djbEid0/halloween_spooky_soundboard.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/ahiQijR/zinusuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/Mjgigjd/live_streaming_abc_news_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/j558vNu/waworabamoduvetali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_c0706a95e8164e5cbc5319508ef651c5.pdf?index=trueIn PDF document text
    • http://fazadag.rf.gd/40026621937.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_e4cff77c904d4acebd583f879afc92c5.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_f5e7054798f7428daeaa8a2f0ee0a1ce.pdf?index=trueIn PDF document text
    • http://todetizos.epizy.com/73252876164.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/sawisagaleri.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_515cd2febb184a68b96a274d7dc195ff.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_5c1cb94e7964410c831372b031b5de77.pdf?index=trueIn PDF document text
    • http://nixomirorubu.myartsonline.com/likekisibozu.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_2cb733082e1b44ce9bd5895e17d1c0e8.pdf?index=trueIn 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
stream_002_off00014ed1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14ED1 5220 bytes
SHA-256: 96777f1d5102182e24188ccc318ae32dca297b2d2598a24401ff5e1ea049e5a7
font_01_sfnt_off000160ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AE 5464 bytes
SHA-256: da0d8f622a22de4535dba90ca93b5fbe1e94a2ee60cd8ebbafc147cd0f0c9957
font_02_sfnt_off00017357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17357 12268 bytes
SHA-256: 2acd8ee0a91865c170875db29121745ed61d6e7496e9e680e7cb66159abddbc9

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