Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f3a356b2a13c52…

MALICIOUS

PDF

35.5 KB Created: 2020-05-16 13:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e126aa998a58c9f4b7141b8cdb8572b1 SHA-1: 99ae1fb86490f75a29438c350ae5bc6cbcb9f133 SHA-256: 12f3a356b2a13c52bc522ddd908dd2f624083802fa7cf79134e6642aff5f8bf1
176 Risk Score

Malware Insights

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

This PDF document contains numerous links to external PDF files, many of which appear to be part of a link farm designed to improve search engine ranking. One prominent link, disguised as a TeamViewer download, is intended to trick users into installing remote support software. The document's structure and the presence of multiple generated URLs suggest a phishing or social engineering attempt to gain unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://tiffanyramsdell.com/uploads/1/3/1/3/131398246/131398246.html#teamviewer+free+14
    • http://localgrownfoods.com/uploads/1/3/1/3/131381006/d7792da6ee206b6.pdf
    • http://litsair.com/uploads/1/3/0/5/130588205/6489217.pdf
    • http://banzaiwraps.com/uploads/1/3/1/1/131163853/xegawi.pdf
    • http://tevegainsurance.com/uploads/1/3/0/4/130435702/sidosed.pdf
    • http://sharalynedgeberg.com/uploads/1/3/0/4/130476917/747404.pdf
    • http://littleragquilt.com/uploads/1/3/0/4/130483623/6848521.pdf
    • http://ecsfrushionwheels.com/uploads/1/3/0/6/130621496/bolufigoxavop-vafoduvadubusi.pdf
    • http://madisongrier.com/uploads/1/3/1/4/131407588/wuzojelaronit.pdf
    • http://timmersdesignanddrafting.com/uploads/1/3/1/8/131856710/wemozatuxafededoso.pdf
    • http://sweetsugatherapy.com/uploads/1/3/1/4/131453253/luretixijudigul.pdf
    • http://bluegrassbirthjourney.net/uploads/1/3/0/5/130589412/lumira-tomopodipatapo.pdf
    • http://safiasclothing.com/uploads/1/3/0/7/130740371/zusaxilijekuwi.pdf
    • http://ou-sooners.us/uploads/1/3/0/6/130639456/908952.pdf
    • http://forestheightsacademyofexcellence.org/uploads/1/3/1/4/131483184/3842532.pdf
    • http://shanesretrogames.com/uploads/1/3/0/6/130622091/905983f186fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b8.bin
59d7d976cae812868982d696b9be0765bbe033f4f5eb3f56193dda345025c897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B8 10060 bytes

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