Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a5edf073078271…

MALICIOUS

PDF

68.7 KB Created: 2021-03-21 05:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc2a63bcc4f1de363c687caa6c6b27f7 SHA-1: 347188c45e3611a6e29e9d904f4c01ee3cb9e0e9 SHA-256: d7a5edf073078271ad9265512cf7a40480162d45531e9cffb9ba74e478a9ce1a
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 other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=macroeconomics+a+european+perspective+blanchard+pdf+download
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/bubot.pdf
    • https://ridawijobufori.weebly.com/uploads/1/3/5/3/135318292/e198160a755c893.pdf
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fc93f1492e1f.pdf
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/wuzesebagujabu-xububorabo-zuzukijezuzapel.pdf
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/tidususofafu.pdf
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/208781.pdf
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/lawidazama.pdf
    • https://cdn-cms.f-static.net/uploads/4370059/normal_601493f22fc3f.pdf
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/gusere_tivovefa_wesasikavuzem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pevivudawof.epizy.com/52238228857.pdf
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_e21cf0df8dd64795ad1fc400b576c7c7.pdf?index=true
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_fc10390df8c64ce4ac1a570b0933aa4b.pdf?index=true
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_9fd0672351934dbcafc78fd39ea3604b.pdf?index=true
    • http://wubexemetaxoru.epizy.com/counter_terrorist_portable_mod_apk.pdf
    • http://fisazivibutaz.epizy.com/barsaat_ki_raat_1960_ming.pdf
    • https://s3.amazonaws.com/farokof/67862498284.pdf
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_443ecea79f92494d9d94204420651c90.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_14e2de73c3ac4045a4dde8c037ef59fa.pdf?index=true
    • http://wivifizurata.epizy.com/app_lock_for_pc.pdf
    • https://s3.amazonaws.com/zizene/dehati_anpadh_hari_se_ringtone.pdf
    • http://dabixuri.rf.gd/swbts_manual_of_style_2017.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0d.bin
2a45853395502b7c53d2c0203dd6f8faf8f66eb6f5837dba910d9bfb68033bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 5692 bytes
font_01_sfnt_off0000df58.bin
2c3ee37225f0d901ef4157665c0af8c9e6daa0acdde3bb02728152e0899c1deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 11084 bytes

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