Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcf695e2bd69d7b…

MALICIOUS

PDF

95.5 KB Created: 2021-03-16 20:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aae9589fb4371d56ae9e3310c11dc338 SHA-1: 796ea18caf3d659f915f2ce462d676a020503ba9 SHA-256: 7fcf695e2bd69d7b1999d54f82b233ecc1abb86bf272c1f71eeab19245ed0040
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by multiple engines, including ClamAV and an ML classifier. It contains a significant number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL observed is 'https://zajinet.ru/wix?keyword=bloon+td+6+apk+18.1', suggesting a lure related to game downloads, which is a common phishing tactic. No scripts were extracted, but the PDF structure itself facilitates the attack by directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/wix?keyword=bloon+td+6+apk+18.1
    • https://vikurevago.weebly.com/uploads/1/3/1/6/131606257/koxiwojus-tulemogovowo-mekiwilevedi-bavenubowanipi.pdf
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/5543817.pdf
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/82a961.pdf
    • http://zazorin.scienceontheweb.net/royal_oak_berry_office_chair.pdf
    • http://vazawujuzu.sportsontheweb.net/55973187530.pdf
    • http://winoxolupuvil.getenjoyment.net/mipudomilagugabaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tomamujuf/10762205366.pdf
    • https://s3.amazonaws.com/suxuzubojut/dokogipezidojuvopel.pdf
    • https://s3.amazonaws.com/marimejerebo/guleruxikiwigipolu.pdf
    • https://s3.amazonaws.com/nunakixuma/pokemon_moon_emerald_walk_through_walls.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/499918644.pdf
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_fe362697ce974ae5a557e54f8ec68669.pdf?index=true
    • https://s3.amazonaws.com/zoromexemuzid/lipanodisobuj.pdf
    • https://s3.amazonaws.com/zagubip/43928390188.pdf
    • https://s3.amazonaws.com/sumesawoxajew/sodopenugaroxonazosawa.pdf
    • https://s3.amazonaws.com/ziwuvijevo/21834516100.pdf
    • https://s3.amazonaws.com/lupuvogotog/zebco_europe_katalog_2020.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_d24fc66c11d8400ba98bd57c820854ee.pdf?index=true
    • https://s3.amazonaws.com/julexekubaj/chamak_challo_chel_chabeli_song_320kbps.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_2a44afcce2364e27bb71f878c6eb74d6.pdf?index=true
    • https://s3.amazonaws.com/xakajoziwibi/capteur_de_temprature_arduino.pdf
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_697c25144575491fa09cf791f8e6c70d.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f4.bin
3bb3c1d6280db8836f30baacecc63d0d596fd362beea4e5615f931adfde06497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 20224 bytes
font_01_sfnt_off00012936.bin
44ce9752a81ccf77dddadf394517820fa2d2d723f2d2bacd7234ac3f12424d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 4844 bytes
font_02_sfnt_off000139bd.bin
fce479deeccba5f87abd1764012bd94018a3260bda5df33ec42ab888ed790276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 10952 bytes
font_03_sfnt_off00015f73.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F73 4324 bytes

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