Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b45a58345f1388e…

MALICIOUS

PDF

80.0 KB Created: 2021-05-02 21:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cbd9ee422530b0d49324f8bea10ec9ed SHA-1: 910a75ea45dd42ea7ce4927f8b802732512f3b73 SHA-256: 5b45a58345f1388ecb5b3cc99a32d6e5a0585d5979597e746d28fb2610ad047c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'baarspo.ru' which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, suggests a lure related to increasing intelligence quotient, a common social engineering tactic. No scripts were extracted, but the presence of external URIs and the overall detection suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://baarspo.ru/strik?utm_term=how+to+increase+your+intelligence+quotient PDF link annotation
    • http://astrohelp.space/23451403688ituqj.pdfIn PDF document text
    • http://cg-designer.xyz/wotewujca8m.pdfIn PDF document text
    • https://cdn.sqhk.co/wabogojo/LicmzKn/24938853771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_60506cf958393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_6061cb796c5da.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/hhpiagf/89537888408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_604f187071b6c.pdfIn PDF document text
    • http://zasazigupat.getenjoyment.net/84365224012.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/hbhjuJy/zifade.pdfIn PDF document text
    • http://armada.technology/17259048048c7lij.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/MidSggI/block_puzzle_legend_mania_2019.pdfIn PDF document text
    • http://maykistore.ru/63866937435wnr1p.pdfIn PDF document text
    • https://cdn.sqhk.co/dirajafowevo/jgM7Fge/pijobetamifubata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_6000928c81b40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5ffa42adb9f15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaloruligot.onlinewebshop.net/general_security_risk_assessment_guideline.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_e6497a9270fa4fb3b0d4be4caa7afa5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/952dfe8a-eab4-400c-9a80-8e5f51c57bca/63985845709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c958ad6-2168-4d23-8183-818473baa293/32359727079.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_ef94a621b20f4495b54413652f14ca50.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_ceb8156e059141c39db6fae05f68d763.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_d67a158fe1564b018147f62d602adfab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f7b6b3-3222-4da4-9583-4e516b735e4d/wapekupupagogikubezoliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4775e4-c322-4b3f-add2-9ccc2a2e313a/what_do_you_need_to_be_an_army_ranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4159d2e-03a5-441c-ac8c-60f1de026dfe/will_cyberpunk_be_free_on_ps5.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/what_does_a_high_absorbance_reading_mean.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_0babb805002c48eea5a17e7ab107b848.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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 5248 bytes
SHA-256: 5546678076316132e15e25f2b4aafbc809346e8c6b84169f7156f60406a68bfc
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10832 bytes
SHA-256: ba0ef3c3256e043a667f177443fd473618dda25b29c322dbc4d6346b4aae2cd9

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