Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc1223d04e3ec9b…

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 13:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 103fd419facbdf1109e4e348a97c93c3 SHA-1: c342193f36bc4f1152c0dbef00abd76f8a320d17 SHA-256: adc1223d04e3ec9b22dc1a9595d632c1da60143437772b8ee786eaabb0f6cacb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of numerous external links suggests it may be used to redirect users to malicious sites or download further payloads, aligning with spearphishing attachment and exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/strik?utm_term=mediashout+5+support PDF link annotation
    • https://cdn.sqhk.co/puxedimuwo/iiGhcVk/grumpy_cat_breed_price.pdfIn PDF document text
    • https://falomomorojed.weebly.com/uploads/1/3/1/4/131438216/pukenifasuzusifi.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/8jdugeO/3d_music_maker_app.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/5762048.pdfIn PDF document text
    • https://cdn.sqhk.co/mesirunomi/jhhibhS/pixelpirate_mod_apk.pdfIn PDF document text
    • https://tijukubi.weebly.com/uploads/1/3/4/4/134458902/a8d761acc1f.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/giGjaO6/nyc_311_alternate_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/cRnSgfO/17176897104.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/76d0d3.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/ElSgeT3/granny_square_pattern_free.pdfIn PDF document text
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/tedaxevo-tisuvelize-rojus.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/92175242363.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/jgChinD/fituvomusujugutiguro.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/kezijafaxodulem-rilopizu-vujederil-fepofegazatomuv.pdfIn PDF document text
    • https://cdn.sqhk.co/dujepiwewi/iHjjzhy/iphone_11_pro_ekran_kac_hz.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/a70aa8c87.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/ac2c54f3728c.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/dujukafizolewaz-gavemexu-dixijabosa-zajelat.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/21301948398.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/solidworks_weldments_exercises.pdfIn PDF document text
    • https://sozamevojor.weebly.com/uploads/1/3/5/3/135309273/divunobizet.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/iDDhjFD/safety_apparel_party_chief_vest.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/situkodomanejuni.pdfIn PDF document text
    • https://nipujari.weebly.com/uploads/1/3/1/3/131384055/tafogemewowur_wisopa.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/6915079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozidonozali.myartsonline.com/lima_barreto_lilia_schwarcz.pdfIn 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_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 5144 bytes
SHA-256: 9bca965e7cfbf63c15f4250e5cc592af6866679d000d7fd172d08f6a0e822d00
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 11032 bytes
SHA-256: f43a1d37e45c6d29af1803a8077a710556dbb31f02b0e28aacf61480d0010717