Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ae1043ba33dfb0…

MALICIOUS

PDF

53.3 KB Created: 2020-06-04 13:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30f79d89ce2ede1d7e3282b6a43ebfb1 SHA-1: b50540f2fba42f7c0d30b0d8327451970383a621 SHA-256: 57ae1043ba33dfb0deef55043fcafcbb1ba93e6fa0ec8b517933d59a286fe890
94 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Adobe acrobat pro free full version' and exhibits a link farm of numerous external PDF URLs, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure and embedded URLs suggest a social engineering tactic to drive downloads of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://femmefatalebeauty.net/uploads/1/3/1/3/131381519/131381519.html#adobe+acrobat+pro++free+full+version
    • http://mta-sts.mail.caledonjewels.com/uploads/1/3/1/4/131406441/baparanomugepof-wimoxog-sugamizot.pdf
    • http://kohlpeters.net/uploads/1/3/1/4/131453872/vebaniki.pdf
    • http://onboardaccel.com/uploads/1/3/0/6/130604065/nomozu-koduvix.pdf
    • http://anyroofnow.net/uploads/1/3/0/2/130289272/wenevovomosot.pdf
    • http://cpcontacts.originalwakeskates.com/uploads/1/3/0/7/130776714/581036.pdf
    • http://madeleinesdaughterbridalsalon.com/uploads/1/3/1/0/131070187/kepuwosolaga-kibiral.pdf
    • http://drreneasmith.com/uploads/1/3/0/6/130604129/xiwuji_katizozovevire_voteniv_sigibomutubunep.pdf
    • http://awesomesandiegocleaning.com/uploads/1/3/1/6/131606140/5325f7d0b9fd0b7.pdf
    • http://chandlerbreeart.com/uploads/1/3/0/9/130969118/newejimoratir.pdf
    • http://mavesolucionesedilicias.net/uploads/1/3/1/4/131408062/rivan.pdf
    • http://mx3.jarkoch.com/uploads/1/3/1/4/131413148/vejenuni.pdf
    • http://femmefatalebeauty.net/uploads/1/3/1/3/131381519/terms.html
    • http://femmefatalebeauty.net/uploads/1/3/1/3/131381519/dmca.html
    • http://femmefatalebeauty.net/uploads/1/3/1/3/131381519/policy.html
    • https://sofifetipi.files.wordpress.com/2020/06/6100096826.pdf
    • https://joxaloli.files.wordpress.com/2020/06/54417808707.pdf
    • https://piwigaf.files.wordpress.com/2020/06/vawedigimosose.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f1f.bin
1f8e03f46353bb6fe28e0ad1ed0bb5d632822fe9e4db26bed12ee09246a845b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1F 4540 bytes
font_01_sfnt_off00007efd.bin
60b2aa3e45887b4891b3ea2079a5abe5142e09c4f10eb1e3cca36b0c10400b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFD 21292 bytes
font_02_sfnt_off0000afb8.bin
2f7b1487ce0f5963354bcc75788704471656f00f227742377d466eeb0dc0fcc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB8 16628 bytes