Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed81c45574c8f830…

MALICIOUS

PDF

77.5 KB Created: 2021-05-24 03:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c4a3db7e8a305263f3cfd27e8f3b9d9 SHA-1: d2e97ade6fdafad7b8d6c3f11127911d0800adb4 SHA-256: ed81c45574c8f8300ea90684045fcf09025466b91dea3843e369458981e9f5a0
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. ClamAV and ML heuristics confirm the malicious nature of the document. No scripts were extracted, but the presence of numerous external URLs points to a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=tabla+distribucion+normal+estandar+pdf
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/bureverit_bonefe_walel.pdf
    • https://fesomexipilajuj.weebly.com/uploads/1/3/3/9/133997099/9b33e5740c5e.pdf
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/00551b5cd76208.pdf
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/pejareniwefi_mejefoximejovud_wobuzuvufog.pdf
    • https://feketofemij.weebly.com/uploads/1/3/1/4/131452988/5372526.pdf
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/e26d1.pdf
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/9933863.pdf
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/xumivazasutif.pdf
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/domuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad3c5c70-8914-41a7-9fdc-23fd26581f9b/drivers_ed_chapter_7_vocabulary.pdf
    • https://s3.amazonaws.com/zugutixe/rebisi.pdf
    • https://uploads.strikinglycdn.com/files/ef55a4fc-28da-4d5f-ae86-78438332017c/52606818407.pdf
    • https://s3.amazonaws.com/muxegeza/fesan.pdf
    • https://uploads.strikinglycdn.com/files/b7dd5920-ad26-4e41-88f0-d4332a8cac99/what_does_taotao_mean_in_spanish.pdf
    • https://uploads.strikinglycdn.com/files/31d94a29-5773-49c3-8bd3-a9a75975e00c/75083741461.pdf
    • https://s3.amazonaws.com/zunaduxa/gozogew.pdf
    • https://uploads.strikinglycdn.com/files/e5a73423-9a45-4ed5-8eeb-8a1d0a976d39/wobudepo.pdf
    • https://uploads.strikinglycdn.com/files/f09087a9-3639-424f-897a-d9b5a97fe5ef/vudonisupodobize.pdf
    • https://uploads.strikinglycdn.com/files/c93d921f-07eb-4afb-8ea3-428640a643d5/94158779736.pdf
    • https://uploads.strikinglycdn.com/files/ddf7f1cb-4737-4c3e-83d2-8719ffbbccda/where_can_i_stream_the_stand_1994.pdf
    • https://uploads.strikinglycdn.com/files/f2baa1f5-20b6-4fa6-afa9-989bdc50be6e/hp_deskjet_2620_all-in-one_wireless_inkjet_printer_ink.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_off0000ef69.bin
0ad533d47f45565daf934cc084212081755074db9c8ace3211e8af68b93c44ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 5392 bytes
font_01_sfnt_off0001019f.bin
573e3deae7be4ef95e88a45348263bbe76d03ddf02209d48c1ba0a42ec473298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 12140 bytes

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