Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7d8c47c9b6a4bc…

MALICIOUS

PDF

82.0 KB Created: 2020-12-06 15:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fb76a894d012322b2d3a6641de2afff7 SHA-1: 118d3a1cb5cc07d05c909b5e352e88a38a770d9d SHA-256: 7b7d8c47c9b6a4bcb03657b026fa83f0dab1c8034058a161aef664fb725c01aa
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The embedded URL, 'https://trafficel.ru/aws?utm_term=hr+assistant+job+description+resume+pdf', suggests a phishing lure related to job applications. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of malicious intent, likely to redirect users to a compromised site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/aws?utm_term=hr+assistant+job+description+resume+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5fccd90ea417f.pdfIn PDF document text
    • https://sajepenimeb.weebly.com/uploads/1/3/4/3/134368310/mazepatoruwelowu.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/3648129.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/2419729.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/51b30350aab9.pdfIn PDF document text
    • https://dixugoruvaweg.weebly.com/uploads/1/3/4/6/134616472/kamonefowowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5fb3f2bbddf7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfebb179-7844-416d-a44e-47ac34fd9edb/new_jersey_notary_public_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/polewusizim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0ad1c5-20bd-413d-ab6e-de9bbd064f77/xo_roman_numerals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9763767d-4d47-4965-b083-c4a412b625d4/arcsoft_showbiz_5_activation_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/84494507594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da819376-9a0a-44a4-a12e-e4bcd18d790f/dnd_5e_gemstone_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1edce1-734c-4b83-9163-941ba9fb6807/staying_fat_for_sarah_byrnes_chapter_summary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 5448 bytes
SHA-256: 67d8e5616234ae1dac0c129cb4525b6a555c56657b9cfe4cbf1db8012b8b8f02
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 10584 bytes
SHA-256: 04f35d92722d73ce830505afc07dc259ee3c6bedccdbaecfdad93635a649b68c
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16100 bytes
SHA-256: 35b3887cf2620817609c04b9c8cd5f2dc5ebc76fc104a3cf8030977a495f3736

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