Malicious PDF — malware analysis report

Static analysis result for SHA-256 4072015d685ccd41…

MALICIOUS

PDF

83.2 KB Created: 2021-04-06 01:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 802eef6a526def7dd869beb6178d1d90 SHA-1: a83424ab6989bdbc0de9df5be392dcae5db86ac1 SHA-256: 4072015d685ccd41520d27d31396260b514b7bd17010f88be555033c239138ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing lure. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs suggest the primary goal is to redirect users to potentially malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=allegory+of+the+cave+summary+pdf
    • https://cdn.sqhk.co/noxivudeva/gcheBgf/siramufunolilukukozez.pdf
    • https://cdn.sqhk.co/kototokim/6hicift/50542523027.pdf
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/edc879.pdf
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/lalimetigubow.pdf
    • https://vanakiti.weebly.com/uploads/1/3/5/3/135323710/dofoj.pdf
    • http://opensalle.xyz/jalozewamz5zc6.pdf
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5fe706062835b.pdf
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/ruwebexuvukago.pdf
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/biniriw.pdf
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6062ad980a29c.pdf
    • https://static.s123-cdn-static.com/uploads/4389352/normal_5fdd9ab149ecd.pdf
    • https://cdn.sqhk.co/wubunepan/45jjhcA/53096398056.pdf
    • http://bilet-pdd.site/snowman_coloring_pages_imageslucyp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86f806cf-c126-4c9c-8d90-141f39d6234d/nululolupudopenazaw.pdf
    • https://uploads.strikinglycdn.com/files/b2066a6c-d72f-435c-8f26-8da9993d7e4f/what_happens_in_the_four_stages_of_mitosis.pdf
    • https://uploads.strikinglycdn.com/files/079cb8e3-8067-44f9-a417-205bd219fef1/senokebupamedimoru.pdf
    • https://uploads.strikinglycdn.com/files/b81846fa-8da9-463c-9168-b0541fead398/majer.pdf
    • https://s3.amazonaws.com/jupudizadid/811556875.pdf
    • https://s3.amazonaws.com/wulagisi/thinkorswim_web_level_2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001048c.bin
b1eb46e02bd11d6144dd04db1324b2394e5dcf8adf30d41991d2a73f37e05e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 5720 bytes
font_01_sfnt_off000117ef.bin
5a2c78a531eacf4f5424e38b8d875630501cd984dc2dfa5d9564cf80ce962add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 11728 bytes

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