Malicious PDF — malware analysis report

Static analysis result for SHA-256 1627ebfef738f068…

MALICIOUS

PDF

111.7 KB Created: 2021-03-13 16:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3566eb5f14b63ab4bea48df8a0451a3d SHA-1: ed2baeb9e58496f79203d16741ee4017b6187c5d SHA-256: 1627ebfef738f068961d418ca0b87b28e7fd8769571879d38866b955662217f2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact payload or lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=which+bible+is+the+most+accurate+translation+of+the+original+text PDF link annotation
    • http://siwupezomejen.getenjoyment.net/what_can_you_do_with_a_masters_in_systems_engineering.pdfIn PDF document text
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/tijog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449605/normal_5fffb64adeade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fd328f7f1ed2.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/7840816.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/98587579454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_6032320124d92.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/hillsborough_county_public_schools_fall_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_a4755bc0d34949b8a15ac0a9296b67d9.pdf?index=trueIn PDF document text
    • http://kisepupiregeseb.rf.gd/uc_browser_software_for_windows_xp.pdfIn PDF document text
    • http://wugorasu.rf.gd/gizoliwoli.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_c30d0ea53da749149f7bdf6d4d06115d.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_b9c03b2f6827469b921a3a84448fae84.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_c8617714b28c4dbca7fdfdae9f66ffff.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_e4f2eed6137b4be58da02c8f209f59d0.pdf?index=trueIn PDF document text
    • http://biwosagamivi.myartsonline.com/how_to_install_first_alert_smoke__carbon_monoxide_alarm.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_798f2122855f4ba7b1adbc0e57d37c66.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001750a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750A 5516 bytes
SHA-256: 69fa8391b2a23f65a32219ec0afa1a85aaaf41c9964ff1fef5584667c10408f1
font_01_sfnt_off000187b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187B8 12552 bytes
SHA-256: de47cfbb2647ae27dfe00d0381b00ce4e85e324438003b6b4fc968a60e2018ba

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