Malicious PDF — malware analysis report

Static analysis result for SHA-256 f289d3d08986a50f…

MALICIOUS

PDF

80.2 KB Created: 2021-05-10 18:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbd5f1f2cd5bc9bd5a515447b9aadc31 SHA-1: c49d2dd64b12455e73bf1337d0a7d39656d714fd SHA-256: f289d3d08986a50f954b777d705230618c07176f4846c0b70c3b3784bc299330
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm with 30 external links, many pointing to disposable hosting and one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=saeco+incanto+espresso+machine+manual
    • https://cdn-cms.f-static.net/uploads/4446923/normal_603bbe638f74f.pdf
    • http://ruvujagefeko.mygamesonline.org/avoidant_personality_disorder_case_study.pdf
    • http://jekefidaz.mygamesonline.org/full_infinitive_and_bare_infinitive.pdf
    • https://static.s123-cdn-static.com/uploads/4427085/normal_5fdcb8722667c.pdf
    • http://pemowovamig.iblogger.org/rekovexotilebizusu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_8e660af1077a4af78b81bee7cb5a7b12.pdf?index=true
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_e635d82ecc314e3f9d81ab7deb29b16f.pdf?index=true
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_afb8eae706f64e14b753542d57f3bbac.pdf?index=true
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_2ea01b569dea4a81809a15888d275247.pdf?index=true
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_fb0e09d57bf64d1b9997c95d0408eba7.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_ca6b0985093c4e48a20cd30e3e29a992.pdf?index=true
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_c4223f71ddd14f8394f9b465787238a2.pdf?index=true
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_28f943d8356c4dea9999cf9d67b1bc83.pdf?index=true
    • http://jevitof.epizy.com/around_the_world_in_80_days_summary_download.pdf
    • http://fufuzadawefor.onlinewebshop.net/skills_in_biology_biozone.pdf
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_5336f1e4a43e42ed9ec5f4c57dcb89d1.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_211760db578a40ef91fec32dc6e6b610.pdf?index=true
    • http://gipezivav.epizy.com/rikovojupotakuwod.pdf
    • 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_off0000ee24.bin
ebace4773a4beaf5afb7ac9fac4b4848a6308387637618ea004f956e3b9e155c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5156 bytes
font_01_sfnt_off0000ff67.bin
d7eca4ee313430b972a7803af1f64b19608321004fb0e7ae94d72debbc82bbca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 11016 bytes
font_02_sfnt_off0001251a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 4324 bytes

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