Malicious PDF — malware analysis report

Static analysis result for SHA-256 625b5e801a7bf9fb…

MALICIOUS

PDF

98.1 KB Created: 2021-04-05 14:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 0172bd160d56208ae2ca2508cfeb166e SHA-1: 7a85388c37045c29e8123aa42a2348c400357d05 SHA-256: 625b5e801a7bf9fb526e7fd88044bdc9c952d1c5a5ee2da82f6bdcd1ff51ac4d
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to factoring trinomials, directing users to a suspicious URL. The presence of external URIs and link farm characteristics further support a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/wix?keyword=factoring+trinomials+common+core+algebra+1+homework+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453764/normal_5fee75d17dd32.pdfIn PDF document text
    • https://gokodasev.weebly.com/uploads/1/3/5/3/135339924/aae340c50ca2ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494889/normal_60568d961ed1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_605efcae3d946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fdffd701621d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_60199d4571808.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/f9cfcd5808ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_601ed683b9fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_602050bd76bcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5feafea02c75b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_e397dd25ca444117ad41c67dc068706c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8007b656-68a6-4fdf-80be-0f51561f68c9/30293167674.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/american_cookery_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/dawulugalaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6652ae-ce78-4df6-a655-aeabf4569171/pimopatemomexokuzipobeg.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/vetekesegizipusaman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2e0f76-5415-4ff0-8b30-e900a89523f1/whirlpool_wdf320pads_manual.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_7ab6c0958219455193edc955d543581d.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_5ae81e48238f4c5bb3c2419b97c82ef6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76da0c8-ef5a-4d5f-9e6a-e0083e1ddfd7/how_to_make_candy_cane_pool_noodles.pdfIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_1ab5c7256db04e2fb4d660e0c4542ca4.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_7dd5aebef214482db58b399a6c2c2cb6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 5616 bytes
SHA-256: 14912686c1683b2487ca00eb03fc81dff0e93a17095bdb5d007b00b80a2eaf24
font_01_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 12376 bytes
SHA-256: 345334310efed25cc66073afcc508c4bfeab875350d0aadc31edf7edf8dca380
font_02_sfnt_off00016188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16188 6624 bytes
SHA-256: ae838a3945bb4251a3ed6a8a0e041e803e861a2955a576dba3592fb506d9d7a0