Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfd8099b6bbe70d…

MALICIOUS

PDF

77.6 KB Created: 2021-04-30 17:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b8537b1871471fa6278d7eaebab1a17 SHA-1: 26463a600d2f6542164c1dbaeba14c45b087ae1c SHA-256: 7dfd8099b6bbe70d46830dd6b27d5978926a0d4e1b936c331fe72da46b99fe56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=action+verbs+worksheets+for+1st+grade
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/1a3d8adf5163d6f.pdf
    • http://ruwexonofedu.iblogger.org/75193200368.pdf
    • http://sexesex.site/peg_perego_prima_pappa_best_high_chair_coverpat5w.pdf
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/lanafakas.pdf
    • http://on-arenas.com/what_are_the_disorders_of_adrenal_gland5arue.pdf
    • http://maxist.ru/935018635145394n.pdf
    • http://xugafigipi.22web.org/zabivituzoruke.pdf
    • http://vsspb.ru/69635634333sppej.pdf
    • http://dorightunion.com/bimmertech_android_autojqj0j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_4f8dee6ad7e747a980b2e26f7326c5e2.pdf?index=true
    • https://s3.amazonaws.com/nawuvud/guidelines_diabetes_type_2_treatment.pdf
    • https://s3.amazonaws.com/fadedosi/ella_fitzgerald_summertime_piano_sheet_music.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2fbe7f3633464743b49f9dcea0896b20.pdf?index=true
    • http://debefataxa.rf.gd/92229065739.pdf
    • https://s3.amazonaws.com/fosalizuzu/eaton_ultrashift_transmission_oil.pdf
    • https://s3.amazonaws.com/poguvelefa/45191814171.pdf
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_f9c7ea2954bc4d748e5c8afe4917fb4f.pdf?index=true
    • https://s3.amazonaws.com/jenagubadopi/new_movies_2019_action.pdf
    • http://kijijagasakum.rf.gd/economic_and_social_issues_mcq_2020.pdf
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_8431050e03f4480ab76d7d691b6da031.pdf?index=true
    • http://didopip.epizy.com/salepowuja.pdf
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_4d2aefcb66d24da48d8f5a240370078f.pdf?index=true
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_4c16b0bd372d4304a621b5d5d93ef3ea.pdf?index=true
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_eac0f6708d454830832b669750816914.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_7d1446791bec44cb8d2e0dfa122289db.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_off0000e32e.bin
614bf360c15cd5ce7ae415ebefe44f7887db0b927e3b9c556159c89547cde6bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 5436 bytes
font_01_sfnt_off0000f5b6.bin
f46770c73d2de48bd9e036488cf336f419925dfb07fad8e8511b4097132a70b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 10644 bytes
font_02_sfnt_off00011a2d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 4324 bytes

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