Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2a51b241c7c4a4…

MALICIOUS

PDF

82.1 KB Created: 2021-03-24 17:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8aaab18c84274c48a874ccd783c647c SHA-1: 1279949b371f64c19f5c49c1078ee71e9e7cb78f SHA-256: aa2a51b241c7c4a47250792a710e4035c509ff8cdb3aea89382ad5d0f627cc43
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically targeting a 'job abandonment letter' keyword, suggesting a phishing or social engineering lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/wix?keyword=job+abandonment+letter
    • http://netopodimamo.mywebcommunity.org/45782658890.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_601fa95fb69a0.pdf
    • https://cdn.sqhk.co/repipedifavi/ii4eqib/24572478055.pdf
    • https://cdn-cms.f-static.net/uploads/4381766/normal_601f7304ec132.pdf
    • https://static.s123-cdn-static.com/uploads/4385850/normal_5feef51227c27.pdf
    • http://jolujunutido.iblogger.org/barsega_sawan_song_free.pdf
    • http://vorusobowa.66ghz.com/wajunuginiju.pdf
    • http://wolorafo.22web.org/64323383180.pdf
    • http://zipubezexupoka.mywebcommunity.org/quadratic_equation_solving.pdf
    • http://mosomupusafebin.medianewsonline.com/kuwovepul.pdf
    • http://kovafuwir.getenjoyment.net/linux_html_to_conversion.pdf
    • https://cdn.sqhk.co/xevowuto/git5idh/dakimikinozozovomuva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jujazuz.epizy.com/zanukafarufimisufela.pdf
    • https://uploads.strikinglycdn.com/files/31246d2c-2d8f-422a-864e-4a2554e42fcd/92459700188.pdf
    • https://uploads.strikinglycdn.com/files/a3281507-1449-4808-859d-a385c24d7dda/71987903994.pdf
    • http://niselasot.atwebpages.com/jiwuf.pdf
    • https://b147a2f3-58af-4013-9def-597e86e94513.filesusr.com/ugd/47d6bb_52f5208ecb8f4ab9909772cf476aab4e.pdf?index=true
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_672fb54c76124639ac2a7278f8517117.pdf?index=true
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_0e0ca580e4d94809a2b5f1e307459bfe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e9787af-2c51-44af-81f4-d3037d2d01d1/how_to_wind_a_bobbin_on_a_singer_tradition_sewing_machine.pdf
    • https://uploads.strikinglycdn.com/files/1c378429-7d0c-4d7a-9a89-5f70c74fb893/die_unendliche_geschichte_buch_kaufen.pdf
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_064782cb3dc9424489d9040b86e25f0d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64f.bin
853302403158a59d61e0e28dd0db84f9b463a2baa6676cfd9961543da3433006		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 4660 bytes
font_01_sfnt_off00010600.bin
e39b56d553f7b82e75655a0ea8933e6d22eb11fa3223019c5c5d5b2b058f3ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 10992 bytes
font_02_sfnt_off00012b4e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 4324 bytes

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