Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cec5fa6c055c93…

MALICIOUS

PDF

88.5 KB Created: 2021-03-13 17:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 943991ebc518a99623cf392836269dc2 SHA-1: b2b4c4043b179722dfb2afc4dbf3dff79db9f53b SHA-256: 52cec5fa6c055c93cd6b81c785e36b0a566f38e9d110e28b0cc7fb42470b9c07
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains and subdomains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external links, including one with a UTM parameter, points towards an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=why+i+want+a+wife+judy+syfers+analysis PDF link annotation
    • https://cdn.sqhk.co/fiduzosi/Bjh2hhe/throne_of_eldraine_brawl_decks_price.pdfIn PDF document text
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/banejutikema-sitezuropu.pdfIn PDF document text
    • http://ig-mediateam.net/40919728804w7jn7.pdfIn PDF document text
    • https://dezegumi.weebly.com/uploads/1/3/4/1/134108828/2453610.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/Fw3Aid3/81037002183.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/2bEhaAy/nfl_network_spectrum_channel_number.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/cgetHXy/bifolapinawu.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugubobo/ajfighg/66135875793.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/waxaposatijidok-bududuv-wepepujurit-vuneb.pdfIn PDF document text
    • http://dragonflysagewellness.com/jumper_clothing_british3n2kt.pdfIn PDF document text
    • http://obzorov.site/xifeburitiwutesagowixoxfzsyi.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/xokigubesemilekeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09a3dae-5ca5-4cbe-9e9e-81b48b1834a5/roland_barthes_quotes_death_of_the_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2cd4ca-7136-45df-b9f2-399abfae1483/first_alert_carbon_monoxide_alarm_blinking_red_light.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_a24fe7116ef24bedbc6336d25352cd27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1150a99-af10-4b37-ba56-415046bcdda7/educational_psychology_salary_canada.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_0958aadaad9b4111ba3965ad6330ce60.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_53e688d5b54b45fa845b1a4725537edb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/835af7fc-8d72-48c0-84c7-2c96c2f93572/51520439334.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 5280 bytes
SHA-256: 597881f4256911922cd516f6299fd1b7399de911cc2abf8c9053c96f491ce55a
font_01_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 10600 bytes
SHA-256: a21010361e75d1de72a1af36efa31fab9fcaace08287f85ec2b454dce2e779a0
font_02_sfnt_off00013f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e